A random sample of 25 items is drawn from a population whose standard deviation is unknown. The sample mean is z = 830 and the sample standard deviation iss = 5. Use Appendix D to find the values of Student's t. (a) Construct an interval estimate of p with 95% confidence. (Round your answers to 3 decimal places.) The 95% confidence interval is from to (b) Construct an interval estimate of p with 95% confidence, assuming that s = 10. (Round your answers to 3 decimal places.) The 95% confidence interval is from (c) Construct an interval estimate of u with 95% confidence, assuming that s = 20. (Round your answers to 3 decimal places.) The 95% confidence interval is from to (d) Describe how the confidence interval changes as s increases.

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