As mentioned in Exercise 10.29, a company claims that its medicine, Brand A, provides faster relief from
Question:
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Assume that the two populations are normally distributed with unknown and unequal standard deviations.
a. Construct a 99% confidence interval for the difference between the mean relief times for the two brands of medicine.
b. Test at a 1% significance level whether the mean relief time for Brand A is less than that for
Brand B.
c. Suppose that the sample standard deviations were 13.3 and 7.2 minutes, respectively. Redo parts a and b. Discuss any changes in the results.
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a The 99 confidence interval for 1 2 is 1 2 ts 1 2 44 49 2692291921534 5 786 1286 to 286 minutes b S...View the full answer
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