Question: A school-board administrator believes that the average number of days absent per year among students is less than 10 days. From past experience, he knows that the population standard deviation is 3 days. In testing to determine whether his belief is true, he could use one of the following plans:

1. n = 100, \(\alpha =0.01\)
2. n = 75, \(\alpha =0.05\)
3. (i) n = 50, \(\alpha =0.10\)

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