Group A is treated with the drug Irinotecan and Group B is treated with the drug Fluorouracil. The results of the study on the number of months in which the groups reported no cancer-related pain are shown below. Construct a 99% confidence interval for the difference in mean months with no cancer-related pain for the two drugs.

Sample Statistics for Cancer Drugs

Construct the indicated confidence interval for μ₁ - μ₂. Assume the populations are approximately normal with equal variances.

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Irinotecan Fluorouracil -= 8.5 mo s, = 1.5 mo X1 = 10.3 mo 11.2 mo5