Why isn’t the difference between the results of Exercises 13.1 and 14.1 greater than it is?
Answer to relevant QuestionsWhat is the role of random assignment in the anorexia study? Suppose the investigator referred to in Exercise 15.9 decided that instead of running one group and comparing it against µ 0 = 5.8, she would run two groups (one with and one without lesions). She would still expect the ...Generate a table analogous to Table 15.2 for power equal to 0.80, with a = .01, two-tailed. In Exercise 15.3 what sample sizes would be needed to raise power to 0.70, 0.80, and 0.90? For the data in Appendix D, form three groups. (These data are available at www.uvm .edu/~dhowell/fundamentals8/DataFiles/Add.dat.) Group 1 has ADDSC scores of 40 or below, Group 2 has ADDSC scores between 41 and 59, and ...
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