a) A simple random sample of 50 items from a population with a population mean and population s.d. of 30 and 5. provide

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a) A simple random sample of 50 items from a population with a population mean and population s.d. of 30 and 5. provide a 98% confidence interval for the population mean.
b) A simple random sample of 10 items from a normal population (which implies xbar will follow a normal distribution) as follows:
15, 10, 6, 4, 1, 4, 7, 9, 3, 12 provide a 98% confidence interval for the population mean.
(Hint: don't forget to show your manual work to find the mean and s.d. for credit, and you can use =stdev.s in your stats function, i.e., confidence.norm(alpha, stdev.s(array), size))
Show Manual Work
Choose from Equation (8.1) and (8.2) to find the M. Construct the LB and UB for the confidence interval find the xbar and s Choose from Equation (8.1) and (8.2) to find the M.E. Construct the LB and UB for the confidence interval
Excel Stats Functional Work a) Choose from confidence.norm or confidence.t to find the M.E. Construct the LB and UB for the confidence interval
b) Choose from confidence.norm or confidence.t to find the M.E. Please note that it is a workable command in Excel to have a paremater stdev.s(array) in the confidence.t command. Construct the LB and UB for the confidence interval where xbar can be obtained from =average(array)