Suppose you wish to estimate a population mean correct to within 0.15 with a confidence level of .90. You do not know ?^2, but you know that the observations will range in value between 34 and 42. Complete parts a and b. a. Find the approximate sample size that will produce the desired accuracy of the estimate. You wish to be conservative to ensure that the sample size will be ample for achieving the desired accuracy of the estimate. (Hint: assume that the range of the observations will equal 4?.) The approximate sample size is _____. (Round up to the nearest integer.)
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Since we don't have the exact standard deviation, we can estimate it using the range rule of thumb, which states that the standard deviation is approximately one-fourth of the range of the data. Given that the range is 46 (as per the hint), the estimated standard Show more…
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