Question

1) Based on a random sample of 13 tire changes, the mean time to change a tire on a Boeing 777 has a mean of 59.5 minutes with a standard deviation of 7.4 minutes. for 10 tire changes on a Boeing 787, the mean time was 64.3 minutes with a standard deviation of 13.2 minutes. To test for equal variances in a two-tailed F-test at alpha=0.1, the test statistics is euqal to:

a) 0.925

b) 0.561

c) 0.314

d) 0.143

2) Based on a random sample of 13 tire changes, the mean time to change a tire on a Boeing 777 has a mean of 59.5 minutes with a standard deviation of 7.4 minutes. for 10 tire changes on a Boeing 787, the mean time was 64.3 minutes with a standard deviation of 13.2 minutes. After carrying out a two tailed F-test at alpha=0.1, we can reject the null hypothesis of equal population variances. True or False?

Answer 1