Please see attached.

QUESTION 6 A sample of 30 patients in a doctor's office showed that they had to wait an average of 35 minutes before they could see the doctor. The sample standard deviation is 14 minutes. Assume the population of waiting times is normally distributed. At 99% confidence, compute the margin of error. QUESTION 7 A sample of 30 patients in a doctor's office showed that they had to wait for an average of 35 minutes before they could see the doctor. The sample standard deviation is 12 minutes. Assume the population of waiting times is normally distributed. At 90% confidence, compute the lower bound of interval estimate for the average waiting time of all the patients who visit this doctor. QUESTION 8 A university planner wants to determine the proportion of spring semester students who will attend summer school. She surveys 36 current students discovering that 21 will return for summer school. At 90% confidence, compute the margin of error for the estimation of this proportion. QUESTION 9 A university planner wants to determine the proportion of spring semester students who will attend summer school. She surveys 36 current students discovering that 16 will return for summer school. At 90% confidence, compute the lower bound of the interval estimate for this proportion. QUESTION 10 A university planner wants to determine the proportion of spring semester students who will attend summer school. Suppose the university would like a 0.90 probability that the sample proportion is within 0.119 or less of the population proportion. What is the smallest sample size to meet the required precision? (There is no estimation for the sample proportion.) (Enter an integer number.)