Question

Please help me with the problem 4.7! The reference problem 1.20 is attached, and the data is the full data in question 1.20. Thanks!

*4.7. Refer to Copier maintenance Problem 1.20 a. Estimate the expected number of minutes spent when there are 3, 5, and 7 copiers to be serviced, respectively. Use interval estimates with a 90 percent family confidence coefficient based on the Working-Hotelling procedure. b. Two service calls for preventive maintenance are scheduled in which the numbers of copiers to be serviced are 4 and 7. respectively. A family of prediction intervals for the times to be spent on these calls is desired with a 90 percent family confidence coefficient. Which procedure, Scheffé or Bonferroni, will provide tighter prediction limits here? c. Obtain the family of prediction intervals required in part (b), using the more efficient procedure.

20 2
60 4
46 3
41 2
12 1
137 10
68 5
89 5
4 1
32 2
144 9
156 10
93 6
36 3
72 4
100 8
105 7
131 8
127 10
57 4
66 5
101 7
109 7
74 5
134 9
112 7
18 2
73 5
111 7
96 6
123 8
90 5
20 2
28 2
3 1
57 4
86 5
132 9
112 7
27 1
131 9
34 2
27 2
61 4
77 5

Answer 1

b)

Anjhe The Estimcded regiein functicn is

Scatterplot of Y vsX 160 140 120 100 > 80 60 40 20 10 2 4

The sticught Line is the Estimculed regte Sicn function Here, cll thepoints are falling hecur to thetrht line and the Vcriation of the point SCater ftom the Stacuctht lihe is minimum C) דhe value af boiS-o. S80 and it intercept ih gene red as nhen the valuu cf x is 3ero, the mecun toteul time number o minutes spent by the seie, iX-o-580 . But, the negative "Value of time is meaningles人. Hence, the value af bo does rot plovide any relevcnt infcthncuticn d) The pint Hmate of the mec Seivice time heX