A random sample of 23 items is drawn from a population whose standard deviation is unknown. The sample mean is x¯x¯  = 840 and the sample standard deviation is s = 15. Use Appendix D to find the values of Student’s t.   (a) Construct an interval estimate of μ with 98% confidence. (Round your answers to 3 decimal places.)    The 98% confidence interval is from  ?      to      ?      (b) Construct an interval estimate of μ with 98% confidence, assuming that s = 30. (Round your answers to 3 decimal places.)    The 98% confidence interval is from  ?      to      ?     (c) Construct an interval estimate of μ with 98% confidence, assuming that s = 60. (Round your answers to 3 decimal places.)    The 98% confidence interval is from   ?      to      ?      (d) Describe how the confidence interval changes as s increases.    multiple choice The interval stays the same as s increases. The interval gets wider as s increases. The interval gets narrower as s increases.

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