Ten years ago, the mean age of death row inmates was 39.8 according to the US Dept. of Justice. A sociologist wants to test whether that data is still accurate. He randomly selects 12 death row inmates and finds that their mean age is 53 with a standard deviation of 42. Use a 0.05 significance level to test the claim that the mean age of death row inmates is now equal to 39.8, which was the mean age ten years ago.
CorrectThe test statistic is: Incorrect (to 3 decimals) The Critical Value is: ± (to 3 decimals)
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