Good Evening, I have some questions that need answers, please.

1.) Should/ Should not?

Watch your cholesterol: A sample of 315 patients between the ages of 38 and 82 were given a combination of drugs ezetimibe and simvastatin. They achieved a mean reduction in total cholesterol of 0.94 millimole per liter. Assume the population standard deviation is o = 0.17. Part 1 of 3 (a) Construct an 80% confidence interval for the mean reduction in total cholesterol in patients who take this combination of drugs. Round the answer to at least two decimal places. An 80% confidence interval for the mean reduction in cholesterol is 0.93 0.95 Part: 1 / 3 Part 2 of 3 (b) Should this confidence interval be used to estimate the mean reduction in total cholesterol for patients between the ages of 89 and 95? The confidence interval (Choose one) be used to estimate the mean reduction in total X 5 cholesterol for patients between the ages of 89 and 95.SAT scores: A college admissions officer takes a simple random sample of 100 entering freshmen and computes their mean mathematics SAT score to be 458. Assume the population standard deviation is o = 111. Part 1 of 4 (a) Construct a 99.9% confidence interval for the mean mathematics SAT score for the entering freshman class. Round the answer to the nearest whole number. A 99.9% confidence interval for the mean mathematics SAT score is 421 495 Part: 1 / 4 Part 2 of 4 (b) If the sample size were 120 rather than 100, would the margin of error be larger or smaller than the result in part (a)? Explain. The margin of error would be (Choose one) V Since (Choose one) V in the sample size X will (Choose one) V the standard error. decrease increase(b} If the sample size were 120 rather than 100, would the margin of error be larger or smaller than the result in part (8)? Explain. The margin of error would be (mo-use one) 1 , since {Choose one) 1' in the sample size 1Will (Choose one) 1 the sta smaller Part 2 of 4 (b) If the sample size were 120 rather than 100, would the margin of error be larger or smaller than the result in part (a)? Explain. The margin of error would be (Choose one) Since (Choose one) in the sample size (Choose one) the standard error. an increase X will 5 a decreaseLifetime of electronics: In a simple random sample of 100 electronic components produced by a certain method, the mean lifetime was 125 hours. Assume that component lifetimes are normally distributed with population standard deviation o = 20 hours. Round the critical value to no less than three decimal places. Part 1 of 2 (a) Construct a 98% confidence interval for the mean battery life. Round the answer to the nearest whole number. A 98% confidence interval for the mean battery life is 120 130 Part: 1 / 2 Part 2 of 2 (b) Find the sample size needed so that a 99% confidence interval will have a margin of error of 3. A sample size of is needed so that a 99% confidence interval will have a margin of error of 3. Round the sample size up to the nearest integer.Get an education: In 2012 the General Social Survey asked 833 adults how many years of education they had. The sample mean was 9.77 years with a standard deviation of 9.53 years. Part 1 of 2 (a) Construct a 99% confidence interval for the mean number of years of education. Round the answers to at least two decimal places. A 99% confidence interval for the mean number of years of education is 8.92