Refer to Exercise 11.61.
a. Calculate the predicted response time if there is a backlog of four customers.
b. Place a 95% prediction interval on your prediction in part (a).
c. Compute a 95% confidence interval on the mean response time for situations where there is a backlog of four customers. Compare this interval to the interval computed in part (b).
d. What is the difference in interpretation of the two intervals computed in parts (b) and (c)?
e. The manager has requested an estimate of the mean response time if there was a backlog of seven customers. What is the problem with producing the estimate?
In exercise

Backlog 00 0 0 00 0 0 0 0 0 00 Resp time 2 3 5 6 8 10 13 15 16 20 24 27 32 3 42 Resp. time 12 23 51 36 48 112 123 163 172 120 252 237 212 245 246 Backlog 22 22 2 2 2 2 222 Resp, time 42 38 105 156 158 210 183 215 216 320 324 278 332 375 412 Backlog 333 33 33 3 3 3 33 3 3 Resp. time 62 73 58 126 208 270 313 45 416 320 324 427 432 435 442 Backlog 44 4 4 4 4 4 4 44 4 4 444 Resp. time 82 93 105 206 278 310 313 415 316 420 424 527 532 635 642