Determining the correct sample size

Reference no: EM1319335

1. An aircraft manufacturer is attempting to determine if the average leg length of the adult male has changed from 44". A sample of 81 men was selected randomly and the average length was found to be 45.5", with a standard deviation of 5.5". Test the null hypothesis that the average leg length of the adult male is 44", at a = 0.05.

2. If Z = 1.96, s = 3, and E = 1, determine the correct sample size.

a. 150

b. 35

c. 6

d. 12

Reference no: EM1319335

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