A disadvantage of the experimental design in Example 8 on weight change in anorexic girls is that girls could change weight merely from participating in a study. In fact, girls were randomly assigned to receive a therapy or to serve in a control group, so it was possible to compare weight change for the therapy group to the control group. For the 26 girls in the control group, the weight change had x = -0.5 and s = 8.0. Repeat all five steps of the test of H0: μ = 0 against Ha: μ ≠ 0 for this group, and interpret the P-value.
Answer to relevant QuestionsA crossover study of 13 children suffering from asthma (Clinical and Experimental Allergy, vol. 20, pp. 429–432, 1990) compared single inhaled doses of formoterol (F) and salbutamol (S). The outcome measured was the ...Suppose the mean GPA of all students graduating from the University of Alabama in 1985 was 3.05. The registrar plans to look at records of students graduating in 2011 to see if mean GPA has changed. Define notation and state ...Consider the test of H0: The defendant is not guilty against Ha: The defendant is guilty. a. Explain in context the conclusion of the test if H0 is rejected. b. Describe the consequence of a Type I error. c. Explain in ...Example 11 analyzed political conservatism and liberalism in the United States. Suppose that the sample mean of 4.11 and sample standard deviation of 1.43 were from a sample size of only 25, rather than 1933. a. Find the ...Consider Example 14 about the power of the test used in the TT experiment for testing H0: p = 0.50 against Ha: p > 0.50, where p is the probability of a correct prediction about which hand was nearer the researcher’s hand. ...
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