A random sample of 26 items is drawn from a population whose standard deviation is unknown. The sample mean is a= 860 and the sample standard deviation is s= 20. Use Appendix D to find the values of Student's t. (c) Construct an interval estimate of u with 95% confidence, assuming thats = 80. (Round your answers to 3 decimal places.) The 95% confidence interval is from to (d) Describe how the confidence interval changes as s increases. O The interval stays the same as s increases. O The interval gets wider as s increases. O The interval gets narrower as s increases.

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