题目
题目
单项选择题

Points earned on a biology exam and hours spent studying for the exam were recorded for a random sample of college students.  This data is presented in the scatterplot below.  The correlation (or r) between points earned and hours spent studying for this sample of data is equal to 0.84, and the regression equation to predict points earned based on hours spent studying is given below: Predicted points earned = 38.60 + 2.70 (hours studied) Based on this information, which one of the following statements is correct?

选项
A.The correlation coefficient should have the units of “hours per point.”
B.If time spent studying for the exam was measured in minutes instead of hours, the value of r would not change.
C.If we decide to predict hours spent studying for the exam based on points earned on the exam, the value of r would change.
D.A student who studies for 0 hours is predicted to earn an exam score of 20 points.
E.None of the above statements are correct.
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思路分析
As we analyze the statements, we proceed option by option to understand why each is true or false before identifying the correct one. Option 1: 'The correlation coefficient should have the units of “hours per point.”' Correlation (r) is a dimensionless measure that describes the strength and direction of a linear relationship, and it doe......Login to view full explanation

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