Study Time versus Grades. A math instructor asked her students to keep track of how much t...

Study Time versus Grades. A math instructor asked her students to keep track of how much time each spent studying a chapter on functions in her algebra-trigonometry course. She collected the information together with test scores from that chapter’s test. The data are listed in the table below.

a) Use a graphing calculator to model the data with a linear function.

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b) Predict a student’s score if he or she studies 24 hr,6 hr,and l8 hr.

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c) What is the correlation coefficient? How confident are you about using the regression line to predict function values?