(Solved): Seventy patients with stasis ulcers of the leg were randomly divided into two ...

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Seventy patients with stasis ulcers of the leg were randomly divided into two groups of equal size. Each group received a different treatment for edema. At the end of the experiment, treatment effectiveness was measured in terms of reduction in leg volume as determined by water displacement. The means and standard deviation for the two groups were as follows Assume that the two populations are normal with the same variance a) Construct a \( 95 \% \) confidence interval for the difference between the two population means b) Construct a \( 95 \% \) confidence interval for the mean of population \( \mathrm{A} \) c) Construct a \( 95 \% \) confidence interval for the variance of population B. d) Construct a \( 95 \% \) confidence interval for the ratio of the two population variances.