Refer to the data in exercise 31.

a. Develop an estimated regression equation that can be used to predict Delay by using Industry and Quality.
b. Plot the residuals obtained from the estimated regression equation developed in part (a) as a function of the order in which the data are presented. Does any autocorrelation appear to be present in the data? Explain.
c. At the .05 level of significance, test for any positive autocorrelation in the data.
.

13221 42213233221422221322231123242414321 ri en cl1 435-5321122521523243535|54245-4-455 b 01010 00100010000000001001000011000000100 May 62 45 54 71 91 62 61 69 80 52 47 65 60 81 73 89 71 76 68 68 86 76 67 57 55 54 69 82 94 74 75 69 71 79 80 91 92 46 72 85 549244591901262 64579 66685466 8 7 8 7 7 6 6 8 7 6 5 5 5 6 8 9 7 7 6 7 7 8 9947