Reconsider Exercise 13-8 in which the effect of different circuits on the response time was investigated. Suppose that the three circuits were selected at random from a large number of circuits.

(a) How does this change the interpretation of the experiment?

(b) What is an appropriate statistical model for this experiment?

(c) Estimate the parameters of this model.

Exercise 13-8

The response time in milliseconds was determined for three different types of circuits in an electronic calculator. The results are recorded here.

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Subjects (Observations) 5 6 115.9 119.5 98.9 101.9 98.8 100.9 Factor 3. 8. 10 11 12 115.8 100.0 102.8 118.8 105.4 102.1 122.6 115.6 102.7 115.1 99.8 116.9 107.9 93.5 115.4 113.6 DC 115.6 104.5 DC + MK MC 102.6 100.9 101.1 105.8 97.1 99.6 102.7 98.7 94.7 97.8 99.7 98.6