Do the calculations by hand. Use the data in Exercise
Chapter , Problem 15.19(choose chapter or problem)
Do the calculations by hand. Use the data in Exercise 15.17 for children telling Story 2 to carry out by hand the steps in the Wilcoxon rank sum test. STORY (a) Arrange the 10 observations in order and assign ranks. There are no ties. (b) Find the rank sum W for the 5 high-progress readers. What are the mean and standard deviation of W under the null hypothesis that low-progress and high-progress readers do not differ? (c) Standardize W to obtain a z statistic. Do a Normal probability calculation with the continuity correction to obtain a one-sided P-value. (d) The data for Story 1 contain tied observations. What ranks would you assign to the 10 scores for Story 1?
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