# Hypothesis testing and confidence interval

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Exercise 8.5

Find a confidence interval for u assuming that each sample is from a normal population.

a. x = 14, sigma = 4, n = 5, 90 percent confidence

b. x = 37, sigma = 15, 99 percent confidence

c. x = 121, sigma = 15, 95 percent confidence

Exercise 9.19

Calculate the test statistic and p-value for each sample.

a. H0 = u = 60 versus H1: u does not equal 60, sigma = 0.025, x = 63, sigma = 8, n = 16

b. H0: u is greater than or equal to 60 versus H1: u < 60, sigma = 0.05, x = 58, sigma = 5, n = 25

c. H0: u is less than or equal to H1: u > 60, sigma = 0.05, x = 65, sigma = 8, n =36

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#### Solution Summary

Step by step method for computing test statistic and confidence interval is given in the answer.

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