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. 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
. 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:
i. n=100, a = 0.01
ii. n=75, a= 0.05
iii. n=50, a = 0.1
Which plan has the lowest probability of a Type II error, given that the true population average is 9 days?
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