Several years ago the reported moan ago of an inmate on deat

Several years ago, the reported moan ago of an inmate on death row was 40.7 years A sociologist wondered whether the moan age of a death row inmate has changed since then She randomly selects 39 death row inmates and finds that their moan age is 42.5 with a standard deviation of 9 8 Construct a 95% confidence interval about the moan age of death row inmates. What does the interval imply? Choose the correct hypotheses. Construct a 95% confidence interval about the moan age. (Use ascending order Round to two decimal places as needed) Enter your answer in the edit fields and then click Check Answer.

Solution

The CI is:

40.7 +/-1.96*9.8/sqrt(39)

We looked up 95%\' Confidence level\' Z score.

=37.62 to 43.77