The table shows the grade point averages y of several students and the numbers x of hours they spend watching television each week. a. Use a graphing calculator to find an equation of the line of best fit. Identify and interpret the correlation coefficient. b. Interpret the slope and y-intercept of the line of best fit. c. Another student watches about 14 hours of television each week. Approximate the student's grade point average. d. Do you think there is a causal relationship between time spent watching television and grade point average? Explain.