For the time-shared computer model of Sec. 2.5, suppose that the company is considering a...

For the time-shared computer model of Sec. 2.5, suppose that the company is considering a change in the service quantum length q in an effort to reduce the steady-state mean response time of a job; the values for q under consideration are 0.05, 0.10, 0.20, and 0.40. Assume that there are n = 35 terminals and that the other parameters and initial conditions are the same as those in Sec. 2.5. To obtain IID observations with expectation approximately equal to the steady-state mean response time of a job, it is felt that warming up the models for 50 response times is adequate, after which the next 640 response times are averaged to obtain a basic X_ij observation; independent replications of these 690 response times are then made as needed. Use an appropriate selection procedure from Secs. 10.4.1 and 10.4.2 (other than the procedure) with n₀ = 20, P* = 0.90, and d* = 0.7 to solve each of the following problems.

(a) Select the best of the four values for q.

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(b) Select two values of q, one of which is the best.