8. Cost of repairs: A sample of eight repair records for a certain fiber-optic component was drawn, and the cost of each repair, in dollars, was recorded, with the following results: 30 35 19 23 27 22 26 16. If appropriate, construct a 98% confidence interval for the mean cost of a repair. 1.State the parameter 2. Find the lower and upper confidence limits 3. Find the margin of error, E 4. State the conclusion for the confidence interval and interpret if asked 10. Super Bowl: A simple random sample of 140 residents in a certain town was polled the week after the Super Bowl, and 75 of them said they had watched the game on television. Construct a 95% confidence interval. Does the confidence interval contradict this claim? 1.State the parameter 2. Find the lower and upper confidence limits 3. Find the margin of error, E 4. State the conclusion for the confidence interval and interpret if asked 11. Testing math skills: In order to test the effectiveness of a program to improve mathematical skills, a simple random sample of 45 fifth graders was chosen to participate in the program. The students were given an exam at the beginning of the program and again at the end. The sample mean increase in the exam score was 12.2 points, with a sample standard deviation of 4.7 points. Construct a 99% confidence interval. Does the confidence interval contradict this claim? 1.State the parameter 2. Find the lower and upper confidence limits 3. Find the margin of error, E 4. State the conclusion for the confidence interval and interpret if asked 13. Leaking tanks: Leakage from underground fuel tanks has been a source of water pollution. In a random sample of 107 gasoline stations, 18 were found to have at least one leaking underground tank. Construct a 95% confidence interval 1.State the parameter 2. Find the lower and upper confidence limits 3. Find the margin of error, E 4. State the conclusion for the confidence interval and interpret if asked 14. Waist size: According to the National Health Statistics Reports, a sample of 783 men aged 20-29 years had a mean waist size of 36.9 inches with a standard deviation of 8.8 inches. Construct a 95% confidence interval. is it reasonable to believe that the mean waist size for men aged 20-29 may be 38.7 inches? 1.State the parameter 2. Find the lower and upper confidence limits 3. Find the margin of error, E 4. State the conclusion for the confidence interval and interpret if asked