Video Games and Grade-Point Average Professor Grant Alexander wanted to find a linear

Chapter 4, Problem 19

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Video Games and Grade-Point Average Professor Grant Alexander wanted to find a linear model that relates the number of hours a student plays video games each week, h, to the cumulative grade-point average, G, of the student. He obtained a random sample of 10 full-time students at his college and asked each student to disclose the number of hours spent playing video games and the students cumulative grade-point average. (a) Explain why the number of hours spent playing video games is the independent variable and cumulative gradepoint average is the dependent variable. (b) Use a graphing utility to draw a scatter diagram. (c) Use a graphing utility to find the line of best fit that models the relation between number of hours of video game playing each week and grade-point average. Express the model using function notation. (d) Interpret the slope. (e) Predict the grade-point average of a student who plays video games for 8 hours each week. (f) How many hours of video game playing do you think a student plays whose grade-point average is 2.40?

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