1. Explain why it is important to calculate a confidence interval.
2. Explain the meaning of the term "95 percent confidence."
3. Under what conditions is the confidence interval [x + za/2(s/ 1n)] for m valid?
4. For a fixed sample size, what happens to a confidence interval for m when we increase the level of confidence?
5. For a fixed level of confidence, what happens to a confidence interval for m when we increase the sample size?