Construct a 95% confidence interval about the mean age?

timer Asked: Nov 17th, 2016

Question description

Several years​ ago, the reported mean age of an inmate on death row was 40.5 years. A sociologist wondered whether the mean age of a​ death-row inmate has changed since then. She randomly selects 39 death-row inmates and finds that their mean age is 38.7, with a standard deviation of 10.9. Construct a 95% confidence interval about the mean age of death row inmates.  What does the interval imply? Choose the correct hypotheses.

Upper H 0​: μ = 40.5

Upper H 1​: μ ≠ 40.5

Construct a 95​% confidence interval about the mean age.

​(____, ____​)

​(Use ascending order. Round to two decimal places as​ needed.)

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