In any production process in which one or more workers are engaged in a variety of tasks, the total time spent in production varies as a function of the size of the work pool and the level of output of the various activities. In a large metropolitan department store, it is believed that the number of man-hours worked (y) per day by the clerical staff depends on the number of pieces of mail processed per day (x1) and the number of checks cashed per day (x2). Data collected for n=20 working days were used to fit the model, E(y)=0+1x1+2x2. A A. We are 95% confident that between 47.224 and 119.126 B. We are 95% confident that the mean number of man-hours man-hours will be worked during a single day in which 7,781 worked per day falls between 47.224 and 119.126 for all pieces of mail are processed and 644 checks are cashed. days in which 7,781 pieces of mail are processed and 644 checks are cashed. C. We are 95% confident that the number of man-hours worked D. We expect to predict the number of man-hours worked per per day falls between 47.224 and 119.126. day to within an amount between 47.224 and 119.126 of the true value