Of the following three statements, choose the best option and write a viable argument showing how it is reflected by the cost function for wichita’s factory.

the electricity contract with the utility company is structured so that higher daily energy usage is charged at a lower rate.

the plant’s production processes are performed primarily by robots that are able to work longer hours, when needed, at no additional cost.

overtime wages were required to produce at levels above 25,000 units.

Arandom sample of 15 observations is used to estimate the population mean. the sample mean and the standard deviation are calculated as 172 and 63, respectively. assume that the population is normally distributed. a. with 99 confidence, what is the margin of error for the estimation of the population mean? b. construct the 99% confidence interval for the population mean. c. construct the 95% confidence interval for the population mean. d. construct the 83% confidence interval for the population mean. hint: you need to use excel function =t.inv.2t to find the value of t for the interval calculation.