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11. A nutritionist is interested in whether excessive sugar intake causes hyperactivity in children. Two different study designs are contemplated to examine this issue. Design I-One hundred children with their parents' permission are to be subjects in the study. The nutritionist will randomly divide the children into two groups of fifty. Both groups of children will eat similar diets for a week, including a bowl of cereal, a sandwich, a mairn course, four glasses of a special milkshake, and two candy bars per day. However, in preparing the food in one of the groups' diets, all of the sugar is to be replaced with an artificial sweetener (so the children cannot tell the difference between the two diets). A psychologist who does not know which diet the children were on will then watch them at play and classify each child as showing signs of hyperactivity or showing no signs of hyperactivity Design II-One hundred children will be watched while they play by a psychologist who will classify each child as showing signs of hyperactivity or showing no signs of hyperactivity. This data will then be compared with the results of a diet questionnaire filled out by the children's parents that gives information about the children's sugar intake over the previous week. a. Which design is an observational study and which is a comparative experiment? b. Which of these study designs is likely to be easier to carry out? c. Which design would give more convincing evidence about the relationship between sugar intake and hyperactivity? Explaim

11. A nutritionist is interested in whether excessive sugar intake causes hyperactivity in children. Two different study designs are contemplated to examine this issue. Design I-One hundred children with their parents' permission are to be subjects in the study. The nutritionist will randomly divide the children into two groups of fifty. Both groups of children will eat similar diets for a week, including a bowl of cereal, a sandwich, a mairn course, four glasses of a special milkshake, and two candy bars per day. However, in preparing the food in one of the groups' diets, all of the sugar is to be replaced with an artificial sweetener (so the children cannot tell the difference between the two diets). A psychologist who does not know which diet the children were on will then watch them at play and classify each child as showing signs of hyperactivity or showing no signs of hyperactivity Design II-One hundred children will be watched while they play by a psychologist who will classify each child as showing signs of hyperactivity or showing no signs of hyperactivity. This data will then be compared with the results of a diet questionnaire filled out by the children's parents that gives information about the children's sugar intake over the previous week. a. Which design is an observational study and which is a comparative experiment? b. Which of these study designs is likely to be easier to carry out? c. Which design would give more convincing evidence about the relationship between sugar intake and hyperactivity? Explaim

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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11. A nutritionist is interested in whether excessive sugar intake causes hyperactivity in children. Two different study designs are contemplated to examine this issue. Design I-One hundred children with their parents' permission are to be subjects in the study. The nutritionist will randomly divide the children into two groups of fifty. Both groups of children will eat similar diets for a week, including a bowl of cereal, a sandwich, a mairn course, four glasses of a special milkshake, and two candy bars per day. However, in preparing the food in one of the groups' diets, all of the sugar is to be replaced with an artificial sweetener (so the children cannot tell the difference between the two diets). A psychologist who does not know which diet the children were on will then watch them at play and classify each child as showing signs of hyperactivity or showing no signs of hyperactivity Design II-One hundred children will be watched while they play by a psychologist who will classify each child as showing signs of hyperactivity or showing no signs of hyperactivity. This data will then be compared with the results of a diet questionnaire filled out by the children's parents that gives information about the children's sugar intake over the previous week. a. Which design is an observational study and which is a comparative experiment? b. Which of these study designs is likely to be easier to carry out? c. Which design would give more convincing evidence about the relationship between sugar intake and hyperactivity? Explaim
Transcribed Image Text:11. A nutritionist is interested in whether excessive sugar intake causes hyperactivity in children. Two different study designs are contemplated to examine this issue. Design I-One hundred children with their parents' permission are to be subjects in the study. The nutritionist will randomly divide the children into two groups of fifty. Both groups of children will eat similar diets for a week, including a bowl of cereal, a sandwich, a mairn course, four glasses of a special milkshake, and two candy bars per day. However, in preparing the food in one of the groups' diets, all of the sugar is to be replaced with an artificial sweetener (so the children cannot tell the difference between the two diets). A psychologist who does not know which diet the children were on will then watch them at play and classify each child as showing signs of hyperactivity or showing no signs of hyperactivity Design II-One hundred children will be watched while they play by a psychologist who will classify each child as showing signs of hyperactivity or showing no signs of hyperactivity. This data will then be compared with the results of a diet questionnaire filled out by the children's parents that gives information about the children's sugar intake over the previous week. a. Which design is an observational study and which is a comparative experiment? b. Which of these study designs is likely to be easier to carry out? c. Which design would give more convincing evidence about the relationship between sugar intake and hyperactivity? Explaim
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