Question

Shorney Construction Company bids on projects assuming that the mean idle time per worker is 72 or fewer minutes per day. A sample of 30 construction workers will be used to test this assumption. Assume that the population standard deviation is 20 minutes.
a. State the hypotheses to be tested.
b. What is the probability of making a Type II error when the population means idle time is 80 minutes?
c. What is the probability of making a Type II error when the population means idle time is 75 minutes?
d. What is the probability of making a Type II error when the population means idle time is 70 minutes?
e. Sketch the power curve for this problem.

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