16.120 Refer to Exercise 16.4. a. Calculate the predicted values of y. b. Determine the residuals. c. Plot the residuals (on the vertical axis) and the predicted values of y. What does it show? d. Draw a histogram of the residuals. What does this graph tell you about the error term?

Book : Statistics for Management and Economics, 12th Edition. Gerald Keller

16.4 \"15"\" Critics of television often refer to the detrimental effects that all the violence shown on television has on children. However, there may be another problem. It may be that watching television also reduces the amount of physical exercise, caus- ing weight gains. A sample of 15 10-year-old chil- dren was taken. The number of pounds each child was overweight was recorded (a negative number indicates the child is underweight). In addition.J the number ofhours of television viewing per week was also recorded.These data are listed here. Television 42 34 25 35 3? 38 31 33 Overweight 18 6 8 1 13 14 7 ? Television 19 29 38 28 29 36 18 Overweight 9 8 8 5 3 14 7 a. Draw the scatter diagram. b. Calculate the sample regression line and describe what the coefcients tell you about the relationship between the two variables. 16.120 Refer to Exercise 16.4. a. Calculate the predicted values ofy. b. Determine the residuals. :2. Plot the residuals (on the vertical axis) and the predicted values of}. What does it show? d. Draw a histogram of the residuals. What does this graph tell you about the error term