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You work for a chain of taco restaurants and want to estimate the population mean of the wait times in the drive-thru for all customers. To do so, you select a tandom sample of 40 of the chain's drive-thru customers and record the wait time in the drive-thru for each. Assume it is known that the population standard deviation of the wait times in the drive-thru for the taco chain's restaurants is 2.79 minutes. Based on your sample, follow the steps below to construct a 90% confidence interval for the population mean of the wait times in the drive-thru for all customers. (If necessary, consult a list of formulas) (a) Click on "Take Sample to see the results from your random sample of 40 customers. Take Sample Sample w 0 Pont estimate B Population standard deviation 0 Critical valu 0 Enter the values of the sample sure, the point estimate for the population mean, the population standard deviation, and the citical value you need for your 90% confidence interval. (Choose the correct critical value from the table of critical vales provided.) When you are done, select "Compute Compute Number of customers Explanation Check Standard error Sample mean Margn of enor 90% confidence interval: Sample standard deviation X 8 ? Confidence level 99% 95% 90% Critical value Population standard Feaos-2.576 Toes-1960 -1.645 deviation 2.79 España B10
TV9 You work for a chain of taco restaurants and want to estimate the population mean of the wait times in the drive-thru for all customers. To do so, you select a random samole of 40 of the chain's drive-thru customers and record the wait time in the drive-thru for each. Assume it is known that the population standard deciation of the wait times in the drive-thru for the taco chain's restaurants is 2.79 minutes. Based on your sample, follow the steps below to construct a 90% confidence interval for the population mean of the wait times in the drive-thru for all customers (if necessary, consulta list of formulas) (A) Click on "Take Sample" to see the results from your random sample of 40 customers. Tak Sample Sample sue 0 Fortsat 0 Number of customers Pation Mandard deviation 8 Crtal whe 0 Compute 40 Enter the values of the sample sw, the contestimate for the population mean, the population standard deviation, and the criticalxatut you need for your 90% confidence interval (Choose the correct orcal value from the table of critical values provided) when you are done, select "Compute". ? Standard e Sample mean Margin of error 3.97 90% condence verval 99% Sample standard deviation 2.77 Confidence Critical value 2005-2.576 Fas 1.960 Foo-1.645 95% 90% 3 Population standard deviation 2.79 BLUE