Shorney Construction Company bids on projects assuming 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 hypothesis tested
b. What is the probability of making a type 2 error when the population mean idle time is 80 minutes?
c. What is the probability of making a type 2 error when the population mean idle time is 75 minutes?
d. What is the probability of making a type 2 error when the population mean idle time is 70 minutes?
e. Sketch the power curve for this problem