Ten years ago, the mean age of death row inmates was 44.9 according to the US Dept.of Justice. A sociologist wants to test whether that data is still accurate. He randomly selects 7 death row inmates...

Extracted text: Ten years ago, the mean age of death row inmates was 44.9 according to the US Dept.of Justice. A sociologist wants to test whether that data is still accurate. He randomly selects 7 death row inmates and finds that their mean age is 59.8 with a standard deviation of 17.6. Use a 0.005 significance level to test the claim that the mean age of death row inmates is now at most 44.9, which was the mean age ten years ago.