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Re: The PQ&R Corporation has developed a collection of training materials [#permalink]
Hi sajjad,
Could you post the OE for question 3, I am having trouble deducing how the a small subset of tasks would result in the average going up.
Below is my explanation for the first 2 questions.

1.
A. For at least one trainee, the posttraining score was greater than 3 times the pretraining score.

From the graph we can infer that for 2a, the pre-training score = ~5, and post-training score = ~ 65 (> 3 times the pre-training score)
Since, condition mentioned is for at least one trainee = > >= 1.
So, 1 is enough, but from the graph we can easily interpret that the post training scores for 2b, 2c, 2d, 2e, 2f, 2g, 2g is also greater than 3 times the pre-training scores of the respective trainees.

Answer is Yes.

B. The data for Session 1 exhibit a positive correlation between pretraining and posttraining scores.
yes, since the scores for both the sessions are increasing.

Answer is Yes.

C. For the three sessions, the range of pre-training scores is least for Session 2.
Range of Pre-training scores for session 1: 45-25 = ~ 20
For Session 2: 15-5 = ~10
For Session 3: 43-22 = ~21.
We can see, the range is lowest for session 2.

Answer Yes.


2. For each of the three training sessions, select Successful if, on the basis of the given information, it would be considered successful by PQ&R. Otherwise, select Unsuccessful.

Let's do it for Session 1:
The corresponding average pre-training score = (25+28+30+35+40+40+41+42)/8 = 45.12
=> average (arithmetic mean) post-training score for Session 1: (71 +72+ 77+ 78 + 80 + 80 + 81 + 81)/ 8 = 77.5 (clearly >50% of the average of the pre- training scores.)
=> Training for Session 1 was successful.

For session 2: The wide difference in scores, indicates that the average of the post-training scores is >50% of the average of the pre-training scores.
=> training for Session 2 was also successful.

For Session 3, also the wide difference in scores easily helps us identify the average diff., thus making the training for session 3 also successful.


Thanks.
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Re: The PQ&R Corporation has developed a collection of training materials [#permalink]
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Re: The PQ&R Corporation has developed a collection of training materials [#permalink]
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