One year; the mean age of an inmate on death row was 41.2 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 39.9, with a standard deviation of 9.3. Construct a 95% confidence interval about the mean age. What does the interval imply?
Ho: H1 (Type integers or decimals. Do not round) Construct a 95% confidence interval about the mean age.
The lower bound is _________. The upper bound is _________. (Round to two decimal places as needed.)
What does the interval imply?
0A Since the mean age from the earlier year is not contained in the interval, there is not sufficient evidence to conclude that the mean age had changed. Since the mean age from the earlier year is not contained in the interval, there is sufficient evidence to conclude that the mean age had changed. Since the mean age from the earlier year is contained in the interval, there is sufficient evidence to conclude that the mean age had changed. Since the mean age from the earlier year is contained in the interval, there is not sufficient evidence to conclude that the mean age had changed.