In Example 23.3, we tested whether the average fat lost from 1 year of dieting versus 1 year of exercise was equivalent. The study also measured lean body weight (muscle) lost or gained. The average for the 47 men who exercised was a gain of 0.1 kg, which can be thought of as a loss of 20.1 kg. The standard deviation was 2.2 kg. For the 42 men in the dieting group, there was an average loss of 1.3 kg, with a standard deviation of 2.6 kg. Test to see whether the average lean body mass lost (or gained) would be different for the population of men similar to the ones in this study. Specify all four steps of your hypothesis test. (Use z instead of t.)
Answer to relevant QuestionsProfessors and other researchers use scholarly journals to publish the results of their research. However, only a small minority of the submitted papers is accepted for publication by the most prestigious journals. In many ...On page 565 of the article we are told that “Participants were right-handed subjects who were employees of a biotechnology corporation in Madison, Wisconsin.” To what population do you think the results of this study ...Explain the difference between statistical significance and significance as used in everyday language. In the study by Lee Salk, reported in Case Study 1.1, he found that infants who listened to the sound of a heartbeat in the first few days of life gained more weight than those who did not. In searching for potential ...Refer to the previous exercise. a. Do you think the alternative hypothesis used by the researchers was one-sided or two-sided? Explain. b. Do you think the researchers would be justified in specifying a one-sided alternative ...
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