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(4) A pharmaceutical company makes tranquilizers. It is assumedthat the distribution for the length of time they last isapproximately normal. Researchers in a hospital used
(4) A pharmaceutical company makes tranquilizers. It is assumedthat the distribution for the length of time they last isapproximately normal. Researchers in a hospital used the drug on arandom sample of 9 patients. The effective period of thetranquilizer for the 9 patients have an average of 2.511 hours
and a standard deviation of 0.318 hours. Construct a 95%confidence interval for the population average length of time.Also find the margin of error.
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