random sample of 28 items is drawn from a population whose standard deviation is unknown. The sample mean is = 790 and the sample standard deviation is s= 15.  a. Construct an interval estimate of u with 99% confidence. (Round your answers to 3 decimal places. ) The 99% confidence interval is from ____to ____ b. Construct an interval estimate with u with 99% confidence, assuming that s=30. (Round your answers to 3 decimal places.) The 99% confidence interval is from ____to____ c. Construct an interval estimate of u with 99% confidence, assuming that s=60. (Round your answers to 3 decimal places.)

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