For Questions , Use the Following Narrative

question 8

Multiple Choice

For Questions , use the following narrative
Narrative: Study time and exam score
Suppose an algebra professor found that the correlation between study time (in hours) and exam score (out of 100) is +.80, and the regression line was found to be y = 20 + 4x.He arrived at this equation through years of collecting data on his students, most of whom reported studying anywhere from 0 to 20 hours for his exams.
-{Study time and exam score narrative} Suppose the professor later found out that his correlation was not +.80, but rather it was +.08.How does this change the predictions he can make about exam scores based on study time?

• A)You have to take the results and divide them by 10, because .80/10 = .08.
• B)It won't change the predictions because the regression line stays the same.
• C)The predictions should no longer be used because they won't be very accurate.
• D)Not enough information to tell.

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