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One​ year, the mean age of an inmate on death row was 40.7 years. A sociologist...

One​ year, the mean age of an inmate on death row was 40.7 years. A sociologist wondered whether the mean age of a​ death-row inmate has changed since then. She randomly selects 32 ​death-row inmates and finds that their mean age is 38.9 ​, with a standard deviation of 8.5 . Construct a​ 95% confidence interval about the mean age. What does the interval​ imply?

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