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Suppose you wish to estimate a population mean correct to within 0.15 with a confidence level of 0.90. You do not know sigma2, but you know that the observations will range in value between 33 and 41. Complete parts a and b. 
a. Find the approximate sample size that will product the desired accuracy of the estimate. You wish to be conservative to ensure that the sample size will be ample for achieving the desired accurcay of the estimaye (Hint: assume that the range of the observations will be equal 4sigma)

        __ The approximate sample size is ___
b. Calculate the approximate sample size, making the less conservative assumption that the range of the observations is equal tp 6sigma.
        The approximate sample size is ____