A random sample of 15 items is drawn from a population whose standard deviation is unknown. The sample mean is x= 760 and the sample standard deviation is s= 20. Use appendix D to find the values of students t.  a.) construct an interval estimate of u with 99% confidence ( round answer 3 decimal places. ) b.) construct an interval estimate of u with 99% confidence , assuming that s= 40. ( round answer to 3 decimal places.

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