Question 1

The HR Department wants to estimate the interval for the population mean number of absences in a quarter for the agency's employees using the following data taken from a normally distributed population at the 90 percent level of confidence.

Number of absences (in days) for a random sample of 11 employees
0	1	1	2	2	3	4	4	6	8	11

From the data set, what is the sample mean: _____ (show the answer to 4 decimal places)

Question 2

From the data set, what is the standard deviation: _____ (show the answer to 4 decimal places)

Question 3

(A) Which distribution will you use: z-distribution ort-distribution?

(B) Why did you choose that particular distribution?

Question 4

What is the lower limit of the 90% confidence interval: _____ (show the answer to 4 decimal places)

Question 5

What is the upper limit of the 90% confidence interval: _____ (show the answer to 4 decimal places)