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Question 13.33 / 3.33 ptsSkip to question text.Allante Pizza delivers pizzas throughout its local market area at no charge to the customer. However, customers often tip the driver. The owner is interested in estimating the mean tip income per delivery. To do this, she has selected a simple random sample of 12 deliveries and has recorded the tips that were received by the drivers. These data are:$2.25$2.50$2.25$2.00$2.00$1.50$0.00$2.00$1.50$2.00$3.00$1.50Suppose the owner is interested in developing a 90% confidence interval estimate. Given the fact that the population standard deviation is unknown, what distribution will be used to obtain the critical value?z-distributionCorrect!t-distributionk-distributions-distributionQuestion 23.33 / 3.33 ptsSkip to question text.Suppose a study of 196 randomly sampled privately insured adults with incomes over 200% of the current poverty level is to be used to measure out-of-pocket medical expenses for
prescription drugs for this income class. The sample data are in the file Drug Expenses.Based on the sample data, construct a 95% confidence interval estimate for the mean annual out-of-pocket expenditures on prescription drugs for this income class. Interpret this interval.(161.97, 173.07)(162.08, 172.96)Correct!(163.50, 171.54)(164.19, 170.85)Question 33.33 / 3.33 ptsSkip to question text.A pilot sample of 75 items was taken, and the number of items with the attribute of interest was found to be 15. How many more items must be sampled to construct a 99% confidence interval estimate for pwith a 0.025 margin of error?