Question: You are given the following information obtained from a random sample of 5

observations.

20 18 17 22 18

At 90% confidence, you want to determine whether or not the mean of the population from which this sample was taken is significantly different from 21.

a. State the null and the alternative hypotheses.

b. Compute the standard error of the mean.

c. Determine the test statistic.

d. Test to determine whether or not the mean of the population is significantly different from 21.