Adolescent obesity is a serious health risk affecting more than 5 million young people in the United States alone. Laparoscopic adjustable gastric banding has the potential to provide a safe and effective treatment. Fifty adolescents between 14 and 18 years old with a body mass index higher than 35 were recruited from the Melbourne, Australia, community for the study. Twenty-five were randomly selected to undergo gastric banding, and the remaining 25 were assigned to a supervised lifestyle intervention program involving diet, exercise, and behavior modification. All subjects were followed for two years. Ex21-48ADOBESE.jmp gives the weight losses, in kilograms, for the subjects who completed the study. a. Get the 5-number summaries and mean, s.d for each group. b. Without assuming the two groups having equal variances, give a 95% confidence interval for the mean weight loss difference between the gastric banding and intervention group. c. Test if gastric banding leads to greater weight loss than the lifestyle intervention program, give H0, Ha, test statistic, p-value, conclusion and 95% CI for the mean weight loss difference. d. Now assuming the two groups having equal variances, use the pooled two sample t procedures to redo the questions in (b) and (c).

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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Q1: Adolescent obesity is a serious health risk affecting more than 5 million young people in the United States alone. Laparoscopic adjustable gastric banding has the potential to provide a safe and effective treatment. Fifty adolescents between 14 and 18 years old with a body mass index higher than 35 were recruited from the Melbourne, Australia, community for the study. Twenty-five were randomly selected to undergo gastric banding, and the remaining 25 were assigned to a supervised lifestyle intervention program involving diet, exercise, and behavior modification. All subjects were followed for two years. Ex21-48ADOBESE.jmp gives the weight losses, in kilograms, for the subjects who completed the study.

a. Get the 5-number summaries and mean, s.d for each group.

b. Without assuming the two groups having equal variances, give a 95% confidence interval for the mean weight loss difference between the gastric banding and intervention group.

c. Test if gastric banding leads to greater weight loss than the lifestyle intervention program, give H0, Ha, test statistic, p-value, conclusion and 95% CI for the mean weight loss difference.

d. Now assuming the two groups having equal variances, use the pooled two sample t procedures to redo the questions in (b) and (c).