A random sample of 25 items is drawn from a population whose standard deviation is unknown. The sample mean is x¯x¯ = 850 and the sample standard deviation iss = 15. Use Appendix D to find the values of Student’st.(a) Construct an interval estimate ofμ with 95% confidence.(Round your answers to 3 decimal places.)The 95% confidence interval is from to(b) Construct an interval estimate ofμ with 95% confidence, assuming thats = 30.(Round your answers to 3 decimal places.)The 95% confidence interval is from to(c) Construct an interval estimate ofμ with 95% confidence, assuming thats = 60.(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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