After grading the first exam, your developmental psychology instructor says, "Those students who actually came to class did much better than those of you who showed up once a week." Given this information, you would suspect that the correlation between attendance and grades would be closest to ???______.
A) +.09
B) + .9
C) + 9
D) + 90

Question

Quizplus · Accepted Answer

A correlation coefficient ranges from -1 to +1, with values closer to -1 or +1 indicating a stronger relationship. Since the instructor stated that those who came to class did much better, we can assume that there is a positive relationship between attendance and grades. Option B (+.9) is the closest to +1, indicating a strong positive correlation. Options A, C, and D are not plausible as they are too small or large to reflect a realistic correlation coefficient.

After Grading the First Exam, Your Developmental Psychology Instructor Says