The South African Revenue Service (SARS) believes that it takes typical salary-earning taxpayers less than 40 minutes, on average, to complete their tax return using efiling (the online tax return submission system). To test this claim, SARS randomly selected ten salary-earning taxpayers who had registered for efiling and recorded their time to complete the efiling process. The completion times (in minutes) for the sample of ten taxpayers are given in the table below.

\table[[42,56,29,35,47,45,51,53,39,37]]

Test at the 5% level of significance whether SARS’ claim is likely to be true (i.e., that it takes typical salaryearning taxpayers less than 40 minutes, on average, to complete their tax return using efiling). (20)