Question

Suppose the times (in hours) that it took for a tax preparer to complete 15 randomly

chosen tax returns are given in the file "Test 3 tax return". Assume that the time needed to

complete returns has a normal distribution. At 0.05 significance, test the claim that the mean

time for this preparer to complete a return is more than 1.15 hours.

Hours
1.13
1.55
1.43
0.92
1.25
1.36
1.32
0.85
1.07
1.48
1.2
1.33
1.18
1.22
1.29

Answer 1