Comcast’s customer service department asks its customers to rate their over-the-phone service on a scale of 1–20 immediately after their service has been completed. The company then matches each customer’s rating with the number of minutes the person waited on hold. The following table shows the ratings and number of minutes on hold for 10 randomly selected customers. These data can also be found in the Excel file hold.xlsx.

Minutes Rating Minutes Rating 4 15 2 16 8 13 10 14 0 18 3 20 5 10 8 14 6 14 4 13

a. Construct a scatter plot for these data.

b. Calculate the slope and the y-intercept for the regression equation.

c. Provide an interpretation for the value of the slope.

d. Calculate the SST.

e. Partition the SST into the SSR and SSE.

AppendixLO1