This is an excerpt from the chapter "Weaken the Conclusion" in our book "EducationAisle Critical Reasoning Nirvana":
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Introduce evidence that weakens the conclusion
This is the most common pattern in “weaken the conclusion” questions. The correct answer choice in this case provides additional supporting evidence that gives us a reason to believe that the conclusion is not logical.
For instance, if the argument concludes that in a company, college graduates are less efficient than college-dropouts because college graduates take more time to complete their respective tasks than college-dropouts do, an evidence that would weaken this conclusion would be: college graduates are given more complex tasks to perform than college-dropouts are.
This evidence gives us a reason to believe that the conclusion (that college graduates are less efficient than college-dropouts) is not logical.
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Simple concept...isn't it? Let's see how skilled you are, at applying this concept to the following argument:
The current Mathematics teacher at Ravenwood academy has been consistently evaluated as “average” by the students. The school management is looking at ways to improve the grades of students in Mathematics. Since this teacher has resigned, the school management is considering to offer this position to
Ms. Blinkett, who has excellent teaching skills.
What, if true, could raise doubts about the efficacy of the plan to employ Ms. Blinkett in order to improve the grades of students in Mathematics?
We do not have the five answer choices presented at this time and there is no 'one' correct answer.
Take a stab:).