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705-805 (Hard)|   Evaluate Argument|         
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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 25 Dec 2025, 15:39
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A. This is irrelevant because the teachers experience does not matter since they could be trained
B. We do not care about other subjects at this point hence irrelevant
C. While this is irrelevant we cannot attribute the gain solely to the changes yet this could just be a new normal trend
D. We do not care about what the students do after the success
E. Correct. Yes knowing this is very important because it could nullify the recommendation it true
Ans E
Bunuel
To improve learning outcomes in high school science classes, one district replaced traditional lectures with hands-on lab activities. After one academic year, standardized science test scores in these schools rose by an average of 12 percent. Based on this outcome, the district concluded that the lab-based format is a more effective method of teaching science and has decided to implement it across all schools in the district.

Which of the following would be most useful to know in evaluating the conclusion drawn by the district?

A. Whether the teachers who implemented the lab-based format had prior experience conducting hands-on science instruction.

B. Whether students in schools that adopted the new format also showed improvement in subjects that were still taught through lectures.

C. Whether any other changes to curriculum, scheduling, or student population occurred in the schools that adopted the new teaching format.

D. Whether students who performed better under the new format reported higher levels of interest in pursuing science careers.

E. Whether schools that maintained the traditional lecture-based format showed similar improvements in test scores over the same time period.

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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 25 Dec 2025, 23:09
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The answer is E. The reason being that in the argument we are assuming a rise of an avg 12% in scores in Science in the schools is due to undertaking lab - based format teaching. If we look at E Whether schools that maintained the traditional lecture based format showed similar improvements in test scores over the same time period, if we answer yes, then this questions our assumption, if it's a no it strengthens our assumption that yes it's the lab based format teaching which is improving scores in the Science Subject.
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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 25 Dec 2025, 23:12
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option b is right

if the mark in subject taught in lecture increases then it is not possible to come to a conclusion that lab based method increased the marks

if the mark in subject taught in lecture decreases then we can conclude that lab based mehtod is effective
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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 26 Dec 2025, 02:17
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A. We are not worried about the teachers' prior experience with the lab-based format.
B. This may look like they are performing better even without the lab-based format. But it says other subjects. Let's keep it for now and go through other options.
C. If so, we are not sure how those would affect.
D. Interested or not, the format could still have contributed to an increase in the average. They could be interested because of the lab-based formats, too. So this doesn't do much.
E. Yes, this is better than B(because B talks about other subjects, many factors come to the picture, say subject difficulty, teachers, etc). The average increased for those particular schools as a whole. So if for other schools it increased without the format, it would weaken(maybe lab-based is not the cause); if not, it would strengthen.

Option E.
Bunuel
To improve learning outcomes in high school science classes, one district replaced traditional lectures with hands-on lab activities. After one academic year, standardized science test scores in these schools rose by an average of 12 percent. Based on this outcome, the district concluded that the lab-based format is a more effective method of teaching science and has decided to implement it across all schools in the district.

Which of the following would be most useful to know in evaluating the conclusion drawn by the district?

A. Whether the teachers who implemented the lab-based format had prior experience conducting hands-on science instruction.

B. Whether students in schools that adopted the new format also showed improvement in subjects that were still taught through lectures.

C. Whether any other changes to curriculum, scheduling, or student population occurred in the schools that adopted the new teaching format.

D. Whether students who performed better under the new format reported higher levels of interest in pursuing science careers.

E. Whether schools that maintained the traditional lecture-based format showed similar improvements in test scores over the same time period.

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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 26 Dec 2025, 02:31
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A - whether or not the teachers had prior experience in hands on instruction will not be relevant in knowing whether the method was better over traditional methods.

B - Even if they did show improvement in other lectures, we do not know if it was more than the one shown by lab based methods. It is still the effective method in teaching science.

C - We do not know if any such changes that did happen would have impacted the scores. Moreover, it would have happened across all subjects and not just science.

D - Students perception of the subject post the completion of the course does not affect the efficiency of the lab based method in bringing better results.

E - This is our answer. If the normal method still produced comparable results as lab based method, then something else was the cause for the effect and not necessarily the method of teaching.

Therefore, Option E imo.
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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 26 Dec 2025, 02:57
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Bunuel
To improve learning outcomes in high school science classes, one district replaced traditional lectures with hands-on lab activities. After one academic year, standardized science test scores in these schools rose by an average of 12 percent. Based on this outcome, the district concluded that the lab-based format is a more effective method of teaching science and has decided to implement it across all schools in the district.

Which of the following would be most useful to know in evaluating the conclusion drawn by the district?

A. Whether the teachers who implemented the lab-based format had prior experience conducting hands-on science instruction.

B. Whether students in schools that adopted the new format also showed improvement in subjects that were still taught through lectures.

C. Whether any other changes to curriculum, scheduling, or student population occurred in the schools that adopted the new teaching format.

D. Whether students who performed better under the new format reported higher levels of interest in pursuing science careers.

E. Whether schools that maintained the traditional lecture-based format showed similar improvements in test scores over the same time period.

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A) does ont affects the conculsion that the lab method is effective or not
B) only science is considered in the conclusion
C) it may or may not change the valdidity of conculsion. hence not useful for evaluation
D) it may be they got intersted after lab style course, hence cannot confim the validity of conclusiom
E) yes, this would help in direct comparsion.

E is the answer
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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 26 Dec 2025, 03:30
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Bunuel
To improve learning outcomes in high school science classes, one district replaced traditional lectures with hands-on lab activities. After one academic year, standardized science test scores in these schools rose by an average of 12 percent. Based on this outcome, the district concluded that the lab-based format is a more effective method of teaching science and has decided to implement it across all schools in the district.

Which of the following would be most useful to know in evaluating the conclusion drawn by the district?

A. Whether the teachers who implemented the lab-based format had prior experience conducting hands-on science instruction.

B. Whether students in schools that adopted the new format also showed improvement in subjects that were still taught through lectures.

C. Whether any other changes to curriculum, scheduling, or student population occurred in the schools that adopted the new teaching format.

D. Whether students who performed better under the new format reported higher levels of interest in pursuing science careers.

E. Whether schools that maintained the traditional lecture-based format showed similar improvements in test scores over the same time period.

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Stimulus :

Claim : Lab based teaching is more effective than traditional teaching

Premise : Test score of lab based taught student rose 12%

Options :

A : No, this is irrelevant, experience doesn't matter in comparison ---- Incorrect

B: No, we are focused on subject present in stimulus ---- Incorrect

C: This is very close option, however this comparison is internal and not comparative conclusion with traditional teaching --- Incorrect

D: No, new format will not matter -- Incorrect

E : Ok Perfect, If this is the scenario then there is no usefulness of new lab based teaching. if not, then this new teaching is really useful.

Ans - E
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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 26 Dec 2025, 03:32
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To improve learning outcomes in high school science classes, one district replaced traditional lectures with hands-on lab activities.

After one academic year, standardised science test scores in these schools rose by an average of 12 percent.

Conclusion: Based on this outcome, the district concluded that the lab-based format is a more effective method of teaching science and has decided to implement it across all schools in the district.

Objective: Useful in evaluating the conclusion

Options:

A. Whether teachers had prior experience conducting hands-on science instruction or not does not impact conclusion in two different ways. Incorrect

B. The argument is concerned with science subject only. Incorrect

C. If yes, there may be other factors also impacting the conclusion. If no, still other factors not considered may impact the conclusion. Incorrect

D. The argument is concerned with students choice of subjects in further pursuit in their careers. Incorrect

E. If yes, there may be other factors responsible for increase in standardised science test scores and the conclusion is weakened. If no, then the conclusion is strengthened that lab-based format is more effective method of teaching science.

IMO E
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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 26 Dec 2025, 03:46
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This is Evaluating an argument question. The conclusion drawn by the district is that the lab based format is a more effective method of teaching science and has decided to implement it across all the schools in the district. We need to identify options which will be helpful in evaluating the conclusion drawn by the district:

(A) It's incorrect. Knowing whether teachers were having prior experience would not be useful to evaluate conclusion.\
(B) It's incorrect as we were not concerned subjects other than science that were still taught through lectures.
(C) It's correct. Knowing other factors that might had affected the scoring would help us in evaluating the conclusion. If non of the other possible factors were not responsible , conclusion would be correct. If any other factor was responsible , then conclusion could not be implemented.
(D) It's incorrect as we were not concerned in future careers.
(E) Scoring in Traditional lectures after the plan implemented were none of the concerns.

So C is the correct answer:)
Bunuel
To improve learning outcomes in high school science classes, one district replaced traditional lectures with hands-on lab activities. After one academic year, standardized science test scores in these schools rose by an average of 12 percent. Based on this outcome, the district concluded that the lab-based format is a more effective method of teaching science and has decided to implement it across all schools in the district.

Which of the following would be most useful to know in evaluating the conclusion drawn by the district?

A. Whether the teachers who implemented the lab-based format had prior experience conducting hands-on science instruction.

B. Whether students in schools that adopted the new format also showed improvement in subjects that were still taught through lectures.

C. Whether any other changes to curriculum, scheduling, or student population occurred in the schools that adopted the new teaching format.

D. Whether students who performed better under the new format reported higher levels of interest in pursuing science careers.

E. Whether schools that maintained the traditional lecture-based format showed similar improvements in test scores over the same time period.

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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 26 Dec 2025, 03:57
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Summary: To improve learning outcomes, a district replaced traditional lectures with hands-on lab activities. After one year, science test scores rose by ~12%. Hence the district concluded that the lab format is more effective and has decided to implement it across all schools.

Question type: Evaluation

A. Incorrect. Whether the teachers had experience or not doesn't provide enough info to evaluate the lab format efficiency.
B. Incorrect. This may seem true at first. But the improvement in other traditional-based subjects doesn't explain why hands-on science subject was more effective.
C. Incorrect. This seems too broad and irrelevant to evaluate the argument.
D. Incorrect. Interest of students in science career is out of scope, this doesn't help evaluate the conclusion.
E. CORRECT. If other schools showed similar improvement, the reason might be something else, not the lab format. If other school didn't show improvement, then the lab format is definitely more effective.
Bunuel
To improve learning outcomes in high school science classes, one district replaced traditional lectures with hands-on lab activities. After one academic year, standardized science test scores in these schools rose by an average of 12 percent. Based on this outcome, the district concluded that the lab-based format is a more effective method of teaching science and has decided to implement it across all schools in the district.

Which of the following would be most useful to know in evaluating the conclusion drawn by the district?

A. Whether the teachers who implemented the lab-based format had prior experience conducting hands-on science instruction.

B. Whether students in schools that adopted the new format also showed improvement in subjects that were still taught through lectures.

C. Whether any other changes to curriculum, scheduling, or student population occurred in the schools that adopted the new teaching format.

D. Whether students who performed better under the new format reported higher levels of interest in pursuing science careers.

E. Whether schools that maintained the traditional lecture-based format showed similar improvements in test scores over the same time period.

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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 26 Dec 2025, 04:07
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Let's check each option:
A=> Does not directly effect the improvement. Eliminate
B=> Improvement in other subjects might suggest a general academic improvement, but its indirect. Eliminate.
C=> Does not isolate the effect of the new format. Eliminate.
D=> Student interest is irrelevant. Eliminate.
E=> This is a good control comparison and directly gives information about the effect of the new process on performance.

Answer => E
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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 26 Dec 2025, 04:08
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Let's summarize the argument:
Increase of the lab-based activities ==> better outcome in the standardised tests

We have to find the best way to evaluate this argument, in particular we need something that would remove the most degrees of freedom of this implication. It has to prove that this teaching method is more efficient than traditional teaching.

The last sentence, would prove that the better outcome on the standard test was due either to a purely statistical fluctuation or to the effectiveness of the new teaching method.

Hence IMO E!
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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 26 Dec 2025, 05:11
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A maybe only experienced teachers take these lab classes still the new format might be more effective

B other subjects are not relevant

Correct C we need to see if other factors actually contributed to the improvement

D students with higher interest didn show improvement in the old format

E those who did well with the old format may do even better with the new format
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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 26 Dec 2025, 05:21
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Answer is E, b was also a close choice. A reject as qs not related to teachers. B close call but D is more inclined towards the conclusion of getting better scores.C is out of scope. D reject as students interest is not related to the qs.
Bunuel
To improve learning outcomes in high school science classes, one district replaced traditional lectures with hands-on lab activities. After one academic year, standardized science test scores in these schools rose by an average of 12 percent. Based on this outcome, the district concluded that the lab-based format is a more effective method of teaching science and has decided to implement it across all schools in the district.

Which of the following would be most useful to know in evaluating the conclusion drawn by the district?

A. Whether the teachers who implemented the lab-based format had prior experience conducting hands-on science instruction.

B. Whether students in schools that adopted the new format also showed improvement in subjects that were still taught through lectures.

C. Whether any other changes to curriculum, scheduling, or student population occurred in the schools that adopted the new teaching format.

D. Whether students who performed better under the new format reported higher levels of interest in pursuing science careers.

E. Whether schools that maintained the traditional lecture-based format showed similar improvements in test scores over the same time period.

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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 26 Dec 2025, 05:24
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E. this most showed whether lecture based schools showed similar improvements over the same time, which isolates the specific effect.
A. This did not fit because of how it on the labs.
B. This option doesn't focus on the controlled group as much
C. this asked about potential changes but having a control group trend is what i was looking for.
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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 26 Dec 2025, 06:04
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To improve learning outcomes in high school science classes, one district replaced traditional lectures with hands-on lab activities. After one academic year, standardized science test scores in these schools rose by an average of 12 percent. Based on this outcome, the district concluded that the lab-based format is a more effective method of teaching science and has decided to implement it across all schools in the district.

Which of the following would be most useful to know in evaluating the conclusion drawn by the district?

A. Whether the teachers who implemented the lab-based format had prior experience conducting hands-on science instruction.(Even if the teachers were experienced, the improvement could still be due to other changes like curriculum, student ability, etc) Wrong

B. Whether students in schools that adopted the new format also showed improvement in subjects that were still taught through lectures.(Improvement in other subjects does not directly explain why the science scores improved) Wrong

C. Whether any other changes to curriculum, scheduling, or student population occurred in the schools that adopted the new teaching format.(This option directly addresses the other possible reasons for science score improvement. Maybe the scores improved because of curriculum change, scheduling etc and not because of lab classes alone) Correct

D. Whether students who performed better under the new format reported higher levels of interest in pursuing science careers.(The conclusion is mainly about test scores and not levels of interest in careers, interest matters but still it is weaker than C) Wrong

E. Whether schools that maintained the traditional lecture-based format showed similar improvements in test scores over the same time period.(Even if lecture based format showed improvement it might also be because of other factors like easy textbooks syllabus, scheduling etc. This is weaker than C in evaluating the conclusion) Wrong
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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 26 Dec 2025, 06:27
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Stimulus: Lab-based format is more effective than science-bassed method, and is going to be implemented across schools
Evaluation:
A: teachers has prior experience to teach the new method => not related, we can have more trainings for the teachers => it doesnt affect the argument
B: students adopted new format: taught through lectures, not related because not related to the science-based format
C: changes in new curriculums that adopted the new teaching format, it is the matter of time, not affect the effectiveness of student performance
D: have interest in pursue science career => not related, eliminate
E: maintained the tradional lecture-based show similar improvement => if yes, the new teaching format play NO impact on the students' performance, if no => the new teaching format is effective => E is the correct answer
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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 26 Dec 2025, 06:47
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From the paragraph:
One district replace traditional classes with hands-on lab activities
Scores in these schools improved by 12% avg.
Conclusion arrived - hands-on lab activities are better than traditional. Implement in all schools of the district.

Options:
A. Experience of teachers does not provide evidence that the format in itself was better. Hence no.
B. Other subjects do not directly impact the evidence for improvement shown through the new method. It compares subjects, not method directly. Hence no.
C. This could indirectly affect the outcomes of the teaching method but cannot directly indicate that the new method is better or not. Hence no.
D. Career choice is irrelevant for deciding the effectiveness of the new method. Hence no.
E. Direct comparison with the schools which kept the traditional method of teaching would help in identifying whether the new method was effective or not. If traditional also improved similarly, method of teaching is not the factor and vice versa. Highly relevant comparison. Best option.

Hence, Best option is E
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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 26 Dec 2025, 07:01
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Bunuel
To improve learning outcomes in high school science classes, one district replaced traditional lectures with hands-on lab activities. After one academic year, standardized science test scores in these schools rose by an average of 12 percent. Based on this outcome, the district concluded that the lab-based format is a more effective method of teaching science and has decided to implement it across all schools in the district.

Which of the following would be most useful to know in evaluating the conclusion drawn by the district?

A. Whether the teachers who implemented the lab-based format had prior experience conducting hands-on science instruction.

B. Whether students in schools that adopted the new format also showed improvement in subjects that were still taught through lectures.

C. Whether any other changes to curriculum, scheduling, or student population occurred in the schools that adopted the new teaching format.

D. Whether students who performed better under the new format reported higher levels of interest in pursuing science careers.

E. Whether schools that maintained the traditional lecture-based format showed similar improvements in test scores over the same time period.

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A-Teacher having prior experience on hands-on science instruction will not affect the result ,it can only tell how well the format is implemented but if there is any improvement in score, we won't be able to say whether its due to implementation or the format change- Out
B-Improvement in other subject taught through lecture is none of our concern, since we only want to know if lab-based instruction produces improvement or not, its result will solely decide its further implementation-OUT
C-We don't know if the other changes affected the new format, unless the changes affected the new format and its result, this information is of no use to us= Out
D-If the students had higher level of interest , it might help in score improvement , but we won't be able to know the format change actually improved the performance or not- Out
E- If the schools which did not implement lab-based format and still showed similar improvement in student test scores means that lab- based format may have helped improve performance but some other common factor might have caused to improve the score. Knowing this is important to know whether lab -based system actually caused improvement or not- Correct
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12 Days of Christmas GMAT Competition 2025 - Day 9: To improve 26 Dec 2025, 07:05
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A It's relevant to how well labs work, but it doesn't tell if labs caused the 12% rise. Maybe other factors still caused gains. Not the most useful.

B If schools improved in all subjects, that suggests a general school wide factor, weakening the claim. Useful, but indirect.

C ?t's important because it identifies confounding variables. Very useful for causality.

D "interest in pursuing science careers" is irrelevant to whether labs caused the test score improvement now.

E Correct. If traditional schools also improved 12%, then labs aren't special. This is a control group check, the strongest way to see if the labs caused extra improvement beyond what was happening anyway.


IMO E
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