# A math instructor asked her students to keep track of how much time each spent studying a

## Question:

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.
Study Time, x (in hours) Test Grade, y (in percent)
23 ............................................. 81%
15 ............................................. 85
17 ............................................. 80
9 .............................................. 75
21 ............................................. 86
13 ............................................. 80
16 ............................................. 85
11 ............................................. 93
(a) Use a graphing calculator to model the data with a linear function.
(b) Predict a student's score if he or she studies 24 hr, 6 hr, and 18 hr.
(c) What is the correlation coefficient? How confident are you about using the regression line to predict function values?
Fantastic news! We've located the answer you've been seeking!