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

## Question:

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?

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**Related Book For**

## College Algebra Graphs and Models

**ISBN:** 978-0321845405

5th edition

**Authors:** Marvin L. Bittinger, Judith A. Beecher, David J. Ellenbogen, Judith A. Penna