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 explanations, Salk wrote the following. Discuss Salk’s conclusion and the evidence he provided for it. Do you think he effectively ruled out food intake as being important? In terms of actual weight gain the heartbeat group showed a median gain of 40 grams; the control group showed a median loss of 20 grams. There was no significant difference in food intake between the two groups. . . . There was crying 38 percent of the time in the heartbeat group of infants; in the control group one infant or more cried 60 percent of the time. . . . Since there was no difference in food intake between the two groups, it is likely that the weight gain for the heartbeat group was due to a decrease in crying (Salk, May 1973, p. 29)
Answer to relevant QuestionsExplain why it is not wise to accept a null hypothesis. Would it be easier to reject hypotheses about populations that had a lot of natural variability in the measurements or a little variability in the measurements? Explain. Read News Story 19, “Young romance may lead to depression, study says” and use it to answer these questions. a. How many participants were there in this study? b. The story actually reports the magnitude of the ...Suppose a meta-analysis on the risks of drinking coffee included 100,000 participants of all ages across 80 studies. One of the conclusions was that a confidence interval for the relative risk of heart attack for women over ...In a meta-analysis, researchers can choose either to combine results across studies to produce a single confidence interval or to report separate confidence intervals for each study and compare them. Give one advantage and ...
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