Question 1: For a population data set,=13.2. How large a sample should be selected so that the margin of error of estimate for a97%confidence interval foris2.50?

Round your answer up to the nearest whole number.

Question 2: A company that produces detergents wants to estimate the mean amount of detergent in64-ounce jugs at a98%confidence level. The company knows that the standard deviation of the amounts of detergent in all such jugs is0.23ounce. How large a sample should the company take so that the estimate is within0.04ounce of the population mean?

Round your answer up to the nearest whole number.

Question 3: a.Find the value oftfor thetdistribution with a sample size of13and area in the left tail equal to0.10. Round your answer to 3 decimal places.

t=Enter you answer in accordance to the item a) of the question statement

b.Find the value oftfor thetdistribution with a sample size of26and area in the right tail equal to0.025. Round your answer to 3 decimal places.

t=Enter you answer in accordance to the item b) of the question statement.

Question 4:A sample of18observations taken from a normally distributed population produced the following data:

28.2 27.5 25.5 25.1 31.1 23.5 26.3 24.1 28.4 37.3 23.9 28.9 27.8 25.5 27.5 25.2 22.6 22.9

Round your answers to three decimal places.

a.What is the point estimate of?

x=Enter your answer; point estimate

b.Make a90%confidence interval for.

(Enter your answer; confidence interval, lower bound,Enter your answer; confidence interval, upper bound)

c.What is the margin of error of estimate forin partb?

E=Enter your answer; margin of error

Question 5: A random sample of20acres gave a mean yield of wheat equal to42.1bushels per acre with a standard deviation of3bushels. Assuming that the yield of wheat per acre is normally distributed, construct a90%confidence interval for the population mean.

Round your answers to two decimal places.

Question 6:A company randomly selected nine office employees and secretly monitored their computers for one month. The times (in hours) spent by these employees using their computers for non-job-related activities (playing games, personal communications, etc.) during this month are given below.

7 3 9 8 11 4 14 1 6

Assuming that such times for all employees are normally distributed, make a95%confidence interval for the corresponding population mean for all employees of this company.

Round your answers to two decimal places.

Question 7: