The nonparametric statistics textbook by Hollander and Wolfe (1999) discussed a study on a social skills training
Question:
a. Suppose the researchers planned to conduct a one-sided test and believed that the response variable could be highly skewed to the right. Why might they prefer to use the Wilcoxon test rather than a two-sample t test to compare the groups?
b. The data were
Controls: 1042, 1617, 1180, 973, 1552, 1251, 1151, 1511, 728, 1079, 951, 1319
Treated: 874, 389, 612, 798, 1152, 893, 541, 741, 1064, 862, 213
Show how to find the ranks and the mean ranks for the two groups.
c. MINITAB reports the results shown in the output below. Report and interpret the P-value.
d. Report and interpret the confidence interval shown in the output.
MINITAB output
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Related Book For
Statistics The Art And Science Of Learning From Data
ISBN: 9780321755940
3rd Edition
Authors: Alan Agresti, Christine A. Franklin
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