Annual starting salaries for college graduates with degrees in business administration are generally expected to be between $30,000 and $40,000. Assume that a 95% confidence interval estimate of the population mean annt starting salary is desired. a. What is the planning value for the population standard deviation?

For men heights are normally distributed with a mean of 69 inches and a standard deviation of 2.8 inches. If samples of 25 men are selected at random from the population, would the average height found for each sample be more or less varied than the individual measurements taken for each man?B

The wall street journal reported on several studies that show massage therapy has a variety of health benefits and it is not too expensive. A sample of 10 typical one-hour massage therapy sessions showed an average charge of $59. The sample standard deviation for one hour session is standard deviation of 5.50.  A. What assumptions about the population should we be willing to make if a margin of error is desired?  We assume the population distribution is normal.  We assume normal distribution for the population.  B. Using 95% confidence, what is the margin of error? C. Using 99% confident, what is the margin of error?

A random sample of 100,000 credit sales in a department store showed an average sale of $81.25. From past data, it is known that the standard deviation of the population is $10.00. Determine the standard error of the mean. O 0.0001 O 0.0100 O 0.0316 O 10.00