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The results of the study show that overall treatment

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The results of the study show that overall, Treatment B was more effective. However, it was also discovered that when the 700 patients are separated into those who had large stones and those who had small stones, within each of the two groups separately, Treatment A is more effective. Which of the following statement is incorrect ? Selected Answer: C. The stone size (small large) is a lurking variable in this example Question 6 A psychologist randomly selects a large sample of children, ranging in age from 6 to 13 years old. The researcher measures each child’s shoe size (in centimeters); then, each child’s vocabulary (number of words the child knows) is determined using a standard vocabulary test. The results (scatterplot + correlation) are represented below:

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Note the “lonely” observation on the bottom right, which represents a student whose vocabulary is unusually low for his/her shoe size. If we were to remove this observation, which of the following is correct regarding the effect on the correlation r? Selected Answer: C. The value of r will not change. Question 7 A weight loss program provides three follow-up methods for individuals who went through the program and reached their desired weight: monthly in-person meetings, monthly online meetings, and monthly newsletter by mail. In order to assess the effectiveness of the three follow-up methods, the program selects a random sample of 291 individuals and classifies them according to the follow-up method they signed-up for, and whether or not they regained more than 5 pounds a year later. The
results are summarized in the following two-way table: Based on the data, which of the three follow-up methods seems to be most effective for maintaining weight-loss? Regained more than 5 pounds? Follow-up method Total In- person Onlin e Newslett er Yes 26 62 65 153 No 54 58 26 138 Total 80 120 91 291 Selected Answer: A. In- person Question 8 A weight loss program provides three follow-up methods for individuals who went through the program and reached their desired weight: monthly in-person meetings, monthly online meetings, and monthly newsletter by mail. In order to assess the effectiveness of the three follow-up methods, the program selects a random sample of 291 individuals and classifies them according to the follow-up method they signed-up for, and whether or not they regained more than 5 pounds a year later. The results are summarized in the following two-way table: Regained more than 5 pounds? Follow-up method Total In-personOnline Newslette r Yes 26 62 65 153 No 54 58 26 138 Total 80 120 91 291 If the goal of the study is to explore the effect of the follow-up method on maintaining the weight loss, which of the following would be the most appropriate set of values to compare? (In other words, how would you calculate conditional percentages in this case?)

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Selected Answer: E. Compare to to Sunday, January 27, 2019 5:51:27 PM CST
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