The EAI data has information on the annual incomes of managers and whether they have attended the training program or not. This data comprise all the 2500 managers that work for this organization.

Using this information, address the following questions:

Select a simple random sample of 150 managers and another of 250 managers and calculate the point estimates for the population mean, standard deviation, and proportion.

How do the results you obtained for n = 150 and n = 250 compare to the population information? Can you make any conclusions out of this? Why and Why not?