QUESTION:

One year, the mean age of an inmate on death row was 40.6 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 39.7, with a standard deviation of 9.4. Construct a 95% confidence interval about the mean age. What does the interval imply?

Test: Chapter 10 Test Question 9 of 20 This test: 20 point(s) possible This question: 1 point(s) possible Submit test One year, the mean age of an inmate on death row was 40.6 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 39.7, with a standard deviation of 9.4. Construct a 95% confidence interval about the mean age. What does the interval imply? Click the iron to view the table of critical t-vallloc Choose the correct hypotheses. Ho : Hy : A (Type integers or decimals. Do not round.) Construct a 95% confidence interval about the mean age. With 95% confidence, the mean age of a death row inmate is between | | years and years. (Round to two decimal places as needed.) What does the interval imply? O A. 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. O B. 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. O C. 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. O D. 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. 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