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Consider the following scatterplot, regression equation, and correlation of midterm and final exam scores for a class of 15 students. Which of the following are true statements? Select one answer ı points Y ะ 90.6-0.489x , r -0.602 110 100 90 80 , 5어 2 20 40 60 80 100 Mdterm Exam Score I. The same number of students scored 100 on the midterm exam as scored 100 on the final exam. II. Students who scored higher on the midterm exam tended to score higher on the final exam. III. The correlation between midterm and final exam scores is negative IV. The standard deviation of the final exam scores is greater than the standard deviation of the midterm exam scores. A. I, II, III, and IV B. I, III, and IV C. II and III D. I and III E. I and IV
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Answer #1

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We have used here a result from general linear regression theory, the relation between regression coefficient and the Sx, Sy and r.

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