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Bruxism is excessive grinding of the teeth or clenching of the jaw. It can lead to tooth wear, tooth mobility, hypersensitivity, aching jaw muscles, and headaches. Occlusal splints, commonly called bite guards, can be prescribed to reduce wear on teeth. In a clinical study of occlusal splints in the treatment of childhood bruxism, Restrepo et al. used a nondimensional measure called the D factor (the ratio of the square root of the area to the perimeter) to evaluate the form of dental wear. The 34 subjects ranged in age from three to six years old. The researchers randomly assigned 20 and 14 children to the experimental and control groups, respectively. Assume that the researchers randomly recruited all subjects from a population with a normally distributed D factor. Because they drew all subjects from the same population, the researchers assumed that the variances would be equal for each group. The mean baseline D factor for the experimental group'was 13.35; the mean baseline D factor for the control group was 10.91. For each group, the sample standard deviation of the D factor was 2.51. Select the appropriate distribution to test for the difference between the two means. Ot-distribution with 32 degrees of freedom t-distribution with 33 degrees of freedom t-distribution with 13 degrees of freedom Ot-distribution with 28.1 degrees of freedom

Bruxism is excessive grinding of the teeth or clenching of the jaw. It can lead to tooth wear, tooth mobility, hypersensitivity, aching jaw muscles, and headaches. Occlusal splints, commonly called bite guards, can be prescribed to reduce wear on teeth. In a clinical study of occlusal splints in the treatment of childhood bruxism, Restrepo et al. used a nondimensional measure called the D factor (the ratio of the square root of the area to the perimeter) to evaluate the form of dental wear. The 34 subjects ranged in age from three to six years old. The researchers randomly assigned 20 and 14 children to the experimental and control groups, respectively. Assume that the researchers randomly recruited all subjects from a population with a normally distributed D factor. Because they drew all subjects from the same population, the researchers assumed that the variances would be equal for each group. The mean baseline D factor for the experimental group'was 13.35; the mean baseline D factor for the control group was 10.91. For each group, the sample standard deviation of the D factor was 2.51. Select the appropriate distribution to test for the difference between the two means. Ot-distribution with 32 degrees of freedom t-distribution with 33 degrees of freedom t-distribution with 13 degrees of freedom Ot-distribution with 28.1 degrees of freedom

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
Problem 1P
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Bruxism is excessive grinding of the teeth or clenching of the jaw. It can lead to tooth wear, tooth mobility, hypersensitivity, aching jaw muscles, and headaches. Occlusal splints, commonly called bite guards, can be prescribed to reduce wear on teeth. In a clinical study of occlusal splints in the treatment of childhood bruxism, Restrepo et al. used a nondimensional measure called the D factor (the ratio of the square root of the area to the perimeter) to evaluate the form of dental wear. The 34 subjects ranged in age from three to six years old. The researchers randomly assigned 20 and 14 children to the experimental and control groups, respectively. Assume that the researchers randomly recruited all subjects from a population with a normally distributed D factor. Because they drew all subjects from the same population, the researchers assumed that the variances would be equal for each group. The mean baseline D factor for the experimental group'was 13.35; the mean baseline D factor for the control group was 10.91. For each group, the sample standard deviation of the D factor was 2.51. Select the appropriate distribution to test for the difference between the two means. Or-distribution with 32 degrees of freedom t-distribution with 33 degrees of freedom O t-distribution with 13 degrees of freedom Ot-distribution with 28,1 degrees of freedom
Transcribed Image Text:Bruxism is excessive grinding of the teeth or clenching of the jaw. It can lead to tooth wear, tooth mobility, hypersensitivity, aching jaw muscles, and headaches. Occlusal splints, commonly called bite guards, can be prescribed to reduce wear on teeth. In a clinical study of occlusal splints in the treatment of childhood bruxism, Restrepo et al. used a nondimensional measure called the D factor (the ratio of the square root of the area to the perimeter) to evaluate the form of dental wear. The 34 subjects ranged in age from three to six years old. The researchers randomly assigned 20 and 14 children to the experimental and control groups, respectively. Assume that the researchers randomly recruited all subjects from a population with a normally distributed D factor. Because they drew all subjects from the same population, the researchers assumed that the variances would be equal for each group. The mean baseline D factor for the experimental group'was 13.35; the mean baseline D factor for the control group was 10.91. For each group, the sample standard deviation of the D factor was 2.51. Select the appropriate distribution to test for the difference between the two means. Or-distribution with 32 degrees of freedom t-distribution with 33 degrees of freedom O t-distribution with 13 degrees of freedom Ot-distribution with 28,1 degrees of freedom
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