Total plasma volume is important in determining the required plasma component in blood replacement therapy for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that a random sample of 41 male firefighters are tested and that they have a plasma volume sample mean of 37.5 ml / kg (milliliters plasma per kg body weight). Assume that sigma (the population standard deviation) is 7.80 ml / kg for the ditribution of blood plasma. Find the 98% confidence interval for the population mean blood plasma volume in male firefighters.

Question 1

What z-score should be used to calculate the error?

Question 2

What is your total calculated error? (round your answer to two decimal places)

Question 3

Give the full confidence interval with bottom and top limit. (round your answer to two decimal places)

In a survey of 1000 large corporations, 242 said that, given a choice between a job candidate who smokes and an equally qualified nonsmoker, the nonsmoker would get the job. Find a 95% confidence interval for the true value of p, the proportion of corporations that would prefer a nonsmoker for a job. (Round your answer to three decimal places)

Question 4

What z-score should be used to calculate the error?

Question 5

What is your total calculated error? (round your answer to three decimal places)

Question 6

Give the full confidence interval with bottom and top limit. (round your answer to three decimal places)