16.A researcher would like to estimate how much difference in cigarette smoking results from viewing graphic videos (including an autopsy) on the harmful effects of smoking. A sample of 16 smokers is obtained. Half of the smokers (n= 8) view the video and the other half (n= 8) serves as a control group. The number of packs of cigarettes each person smoked during the following week is recorded. The data are as follows:

Controls:M= 17.5,SS= 122

Video Viewers:M= 8.1,SS= 102

A. Use the sample data to make a point estimate of the mean difference in smoking behavior between the control group and the video viewers.

Point estimate = _____. Please clearly write the answer.

B. What is the criticalt? Please clearly write the answer outaway from the solution.

C. What is the lower bound? Please clearly write the answer outaway from the solution.

D. What is the upper bound? Please clearly write the answer outaway from the solution.