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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.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter4: Equations Of Linear Functions
Section4.5: Correlation And Causation
Problem 15PPS
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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.
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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