12. Does Weight Watchers work? Researchers randomly divided 500 people into two equal-sized groups. One group spent 6 months on the Weight Watchers program. The other group received a pamphlet about controlling portion sizes. At the end of the study 35% of the subjects in the pamphlet group and 55% of the subjects in the Weight Watchers group had lost at least 10 pounds. To test whether Weight Watchers is more effective for weight loss than pamphlets, a statistician used an index card to represent each subject in the study and wrote whether or not the subject lost at least 10 pounds on the index card. He then shuffled these cards together, and dealt them into two equal-sized groups. Which of the following best describes the expected result? The difference between the proportions of cards indicating whether or not the subject lost at least 10 pounds will be about 20%. If Weight Watchers was effective, the difference between the proportions of cards indicating whether or not the subject lost at least 10 pounds will be more than 20%. The difference between the proportions of cards indicating whether or not the subject lost at least 10 pounds will be about 0.
12. Does Weight Watchers work? Researchers randomly divided 500 people into two equal-sized groups. One group spent 6 months on the Weight Watchers program. The other group received a pamphlet about controlling portion sizes. At the end of the study 35% of the subjects in the pamphlet group and 55% of the subjects in the Weight Watchers group had lost at least 10 pounds. To test whether Weight Watchers is more effective for weight loss than pamphlets, a statistician used an index card to represent each subject in the study and wrote whether or not the subject lost at least 10 pounds on the index card. He then shuffled these cards together, and dealt them into two equal-sized groups. Which of the following best describes the expected result? The difference between the proportions of cards indicating whether or not the subject lost at least 10 pounds will be about 20%. If Weight Watchers was effective, the difference between the proportions of cards indicating whether or not the subject lost at least 10 pounds will be more than 20%. The difference between the proportions of cards indicating whether or not the subject lost at least 10 pounds will be about 0.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:12. Does Weight Watchers work? Researchers randomly divided 500 people into two equal-sized groups. One group
spent 6 months on the Weight Watchers program. The other group received a pamphlet about controlling portion
sizes. At the end of the study 35% of the subjects in the pamphlet group and 55% of the subjects in the Weight
Watchers group had lost at least 10 pounds. To test whether Weight Watchers is more effective for weight loss
than pamphlets, a statistician used an index card to represent each subject in the study and wrote whether or not
the subject lost at least 10 pounds on the index card. He then shuffled these cards together, and dealt them into
two equal-sized groups. Which of the following best describes the expected result?
The difference between the proportions of cards indicating whether or not the subject lost at least 10
pounds will be about 20%.
If Weight Watchers was effective, the difference between the proportions of cards indicating whether or not
the subject lost at least 10 pounds will be more than 20%.
The difference between the proportions of cards indicating whether or not the subject lost at least 10
pounds will be about 0.
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