Cookbook problems for confidence intervals For each question, conduct a significance test and construct a confidence interval. Use a 95% level of confidence or a 5% level of significance unless otherwise indicated. Interpret the results in context. This means use the following boilerplate:

Question:

Suppose a large labor union wishes to estimate the mean number of hours per month a union member is absent from work. The union decides to randomly sample 320 of its members and monitor their working time for one month. At the end of the month, the total number of hours absent from work is recorded for each employee. If the mean and the standard deviation of the sample are 9.6 hours and s = 6.4 hours, find a 95% confidence interval for the true mean number of hours absent per month per employee.

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