We want to test whether tutoring helps improve exam scores by at least ten points on average. We give a class a midterm exam, then get them tutoring in the material, and give a similar exam one month later. Which of the following is a substantial source of error in this study? O We failed to account for the lurking variable that, having taken a similar exam once already, our scores might improve even without tutoring. We should have chosen students at random from within the class in order to have an unbiased sample. Students of different backgrounds might respond differently to tutoring. O We should use a shorter period between tests, since students may have forgotten material over the month. Students may have gotten more tutoring than what was provided. O Some students are naturally better test takers.
We want to test whether tutoring helps improve exam scores by at least ten points on average. We give a class a midterm exam, then get them tutoring in the material, and give a similar exam one month later. Which of the following is a substantial source of error in this study? O We failed to account for the lurking variable that, having taken a similar exam once already, our scores might improve even without tutoring. We should have chosen students at random from within the class in order to have an unbiased sample. Students of different backgrounds might respond differently to tutoring. O We should use a shorter period between tests, since students may have forgotten material over the month. Students may have gotten more tutoring than what was provided. O Some students are naturally better test takers.
MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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
Transcribed Image Text:We want to test whether tutoring helps improve exam scores by at least ten points on average. We
give a class a midterm exam, then get them tutoring in the material, and give a similar exam one
month later.
Which of the following is a substantial source of error in this study?
O We failed to account for the lurking variable that, having taken a similar exam once already, our scores might
improve even without tutoring.
O We should have chosen students at random from within the class in order to have an unbiased sample.
Students of different backgrounds might respond differently to tutoring.
O We should use a shorter period between tests, since students may have forgotten material over the month.
Students may have gotten more tutoring than what was provided.
O Some students are naturally better test takers.
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