Refer to Problem 3-10. If we wish to detect a maximum difference in mean response times of 10 milliseconds with a probability of at least 0.90, what sample size should be used? How would you obtain a preliminary estimate of σ²?

Problem 3-10.

The response time in milliseconds was determined for three different types of circuits that could be used in an automatic valve shutoff mechanism. The results are shown in the following table:

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Circuit Type Response Time 1 9. 12 10 8 15 20 21 23 17 30 3 5 8 16 7