Please help me to solve this with a brief explanation. Use R if necessary. Thanks!

19.16. Disk drive service. The staff of a scwice center for electronic equipment includes three technicians who speciaiize in repairing three widely used makes ofdisk drives for deSkECP computers. It was desired to study the eects of technician (factor A) and make of disk drive (factor B) on the service time. The data that follow Show the number of minutes 1'61!\"in to Chapter 19 Two-Factor Studies with Equal Sample Sizes 869 complete the repair job in a study where each technician was randomly assigned to ve jobs on each make of disk drive. Factor 3 (make of drive) 2'1\" FaCborA i: i=2 i=3 ,F (technician) Make 1 Make 2 Make 3 i =1 Technician 1 62 5? 59 43 45 53 69 44 47 i = 2 Technician 2 51 61 .55 57 58 58 39 51 49 i: 3 Technician 3 59 58 4? 65 63 56 70 60 50 a. Obtain the tted values for ANOVA model (19.23). b. Obtain the residuals. 0. Plot the residuals against the tted values. What deparmres from ANOVA model (19.23) can be studied from this plot? What are your ndings? d. Prepare a nunnal probability plot of the residuals. Also obtain the coefcient of correla tion between the ordered residuals and their expected values under nunnality. Does the normality assumption appear to be reasonable here? e. The observations ll\" each treatment were obtained in the order shown. Prepare residual sequence plots and analyze them. What are your ndings