# Question: The Bureau of Justice Statistics provides information on prison sentences

The Bureau of Justice Statistics provides information on prison sentences in the document National Corrections Reporting Program. A random sample of 20 maximum sentences for murder yielded the data, in months, presented on the WeissStats CD. Use the technology of your choice to do the following.

a. Find a 95% confidence interval for the mean maximum sentence of all murders. Assume a population standard deviation of 30 months.

b. Obtain a normal probability plot, boxplot, histogram, and stem-and-leaf diagram of the data.

c. Remove the outliers (if any) from the data, and then repeat part (a).

d. Comment on the advisability of using the z-interval procedure on these data.

a. Find a 95% confidence interval for the mean maximum sentence of all murders. Assume a population standard deviation of 30 months.

b. Obtain a normal probability plot, boxplot, histogram, and stem-and-leaf diagram of the data.

c. Remove the outliers (if any) from the data, and then repeat part (a).

d. Comment on the advisability of using the z-interval procedure on these data.

## Answer to relevant Questions

According to the document All About Diabetes, found on the Web site of the American Diabetes Association, ". . .diabetes is a disease in which the body does not produce or properly use insulin, a hormone that is needed to ...This exercise can be done individually or, better yet, as a class project. Gestation periods of humans are normally distributed with a mean of 266 days and a standard deviation of 16 days. a. Simulate 100 samples of nine ...A confidence interval for a population mean has length 20. a. Determine the margin of error. b. If the sample mean is 60, obtain the confidence interval. c. Construct a graph similar to Fig. 8.6 on page 320. In Exercise 8.31, you found a 95% confidence interval for the mean amount of all venture-capital investments in the fiber optics business sector to be from $5.389 million to $7.274 million. Obtain the margin of error by a. ...For a fixed confidence level, show that (approximately) quadrupling the sample size is necessary to halve the margin of error. (Hint: Use Formula 8.1 on page 321.)Post your question