1. Using Table G, find values for2leftand2right, for a 99% confidence interval (=.01) when the sample size isn= 10.

2left= ,2right=

2. Using Table G, find values for2leftand2right, for a 90% confidence interval (=.10) when the sample size isn= 17.

2left= ,2right=

3. On this problem, the answer has been worked out, but you must fill in the blanks in the solution.

A study of carbon monoxide deaths showed that a random sample of 6 recent years had a standard deviation of 4.1 deaths per year. Find the 99% confidence interval of the variance and the standard deviation. Round answers to the nearest tenth (one digit after the decimal point).

Solution: We are finding confidence intervals for the variance and standard deviation, so we use the formulas

4. The calories in a random sample of 14 standard-size candy bars have a standard deviation of 23.2. Find the lower limit of the 95% confidence interval for the population standard deviation. Round your answer to the nearesttenth.

5. The monthly lease rates for a random sample of 8 new cars have a standard deviation of 34.7.Find the upper limit of the 90% confidence interval for the population standard deviation. Round your answer to the nearesttenth.