b) False 3 Question 7 (15 points) A random sample of 28 customers at a gas station shows an average gas purchase of 8.9 gallons with a margin of error of 3.2 gallons: a. What is the confidence interval? . What is the statistical interpretation when the confidence level is 95%? B 9 11 Question 8 (20 points) The administrator at your local hospital states that on weekends the average wait time for emergency room visits is 10 minutes. Based on discussions you have had with friends who have administrator's claim You decide to test your hypothesis. Over the course of a few weekends you record the wait time for 40 randomly selected patients. The average wait time for these 40 patients is 11 minutes with a standard deviation of 3 minutes a) Define the nul and alternative hypotheses. b) Define alpha value, calculate t statistic and find the p-value. c) What do you conclude about the administrators' statement regarding ER wait time? Why? A/ 8 CVB N . Command