Chapter 4.2, Problem 85E

(a)

To determine

To outline a completely randomized design to compare at ${70}^0{\text{ and 90}}^0$ with twenty subjects available.

Explanation of Solution

In the question, an expert on worker performance is interested in the effect of room temperature on the performance of tasks requiring manual dexterity. Thus, a completely randomized design to compare at ${70}^0{\text{ and 90}}^0$ with twenty subjects available is as follows:

  

(b)

To determine

To describe in detail the design of a matched pair experiment in which each subject serves as his or her own control.

Explanation of Solution

In the question, an expert on worker performance is interested in the effect of room temperature on the performance of tasks requiring manual dexterity. Thus, the design of a matched pair experiment in which each subject serves as his or her own control can be explained by that each subject uses the machine twice, once at $70$ degrees and another time at 90 degrees. Order of usage at different temperatures is randomized per subject.