A student at Joliet Junior College conducted a survey of 20 randomly selected full-time students to determine the relation between the number of hours of video game playing each week, x, and grade-point average, y. She found that a linear relation exists between the two variables. The least-squares regression line that describes this relation is y-hat = -0.0526x + 2.9342.
(a) Predict the grade-point average of a student who plays video games 8 hours per week.
(b) Interpret the slope.
(c) If appropriate, interpret the y-intercept.
(d) A student who plays video games 7 hours per week has a grade-point average of 2.68. Is this student’s grade-point average above or below average among all students who play
video games 7 hours per week?