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b.What is the margin of error at the 95% confidence level?2.According to a previous study, check out times at a supermarket are between 3 to 12 minutes (180 to 720 seconds.) A survey involving a random sample of customers of the supermarket is planned and the first order of business is to decide on an appropriate sample size. The 95% level of confidence will be used. (4 points)4
BUSI1013PAMELLA MITCHELLUNIT 6 EXERCISEMAY 17, 2019a.What is the planning value for the population standard deviation to be used in the sample size formula for estimating the population mean check-out time?b.How large should the sample size be if the desired margin of error is 25 seconds?2.Use the data in BUSI1013 Bank Dataset.xlsx(from Unit 1 Exercise Question 2) to answer this question. (4 points)a.Construct a 95% confidence interval to estimate the proportion of customers who would recommend the Bank to family and friends after the change.b.What is the margin of error of the estimate at the 95% confidence level?2.In a survey, the planning value for the population proportion is p* = 0.28. How large should the sample size for the survey be if the desired level of confidence is 95% and the desired margin of error is 0.035? (2 points)5