Use the rank sum test to analyze the data set in Figure
Chapter 15, Problem 15.2.6(choose chapter or problem)
Use the rank sum test to analyze the data set in Figure 9.20 concerning Example 51 on acrophobia treatments. Let population A be with the standard treatment and population B be with the new treatment. (a) Combine the two samples and rank the observations. (b) What is SA? (c) What is UA? (d) Is the value of UA consistent with the new treatment being better than the standard treatment? (e) Use a computer package to nd a one-sided p-value for the null hypothesis H0 : A B versus the alternative hypothesis HA : A < B. (f) Are your conclusions from this analysis consistent with the analysis presented in Section 9.3.4 using the two-sample t-test?
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