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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?

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