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1. You are told that there is a high inverse association between the variables " amount of exercise" and " incidence of heart disease *. A correlation coefficient consistent with the given statement is: C.r= -0.2 A. r= 0.8 B.r= 0.2 D.r= -0.8

1. You are told that there is a high inverse association between the variables " amount of exercise" and " incidence of heart disease *. A correlation coefficient consistent with the given statement is: C.r= -0.2 A. r= 0.8 B.r= 0.2 D.r= -0.8

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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Choose the letter of the correct answer to the question 1. You are told that there is a high inverse association between the variables “ amount of exercise" and " incidence of heart disease ". A correlation coefficient consistent with the given statement is: A. r= 0.8 B.r= 0.2 C.r= -0.2 D.r= -0.8 2. Which among the given correlation coefficients shows the highest strength of association between variables? C.0.1 В. -0.95 А. -1.0 D. 0.88 3. If the relationship between x and y is positive, as variable y decreases, variable x: B. decreases A. increases C. remains the same D. equals zero 4. Of the following measurement levels, which is required for the valid calculation of the Spearman correlation coefficient? A. nominal B. ordinal C. interval D. ratio 5. Professor Bill obtained a correlation of -0.85 between body weight and IQ. This means that: A. Obesity decreases intelligence. B. Heavy people have higher IQs than light people. C. People with high IQs are likely to be light. D. Malnutrition damages the brain. 6. In a " negative * relationship: A. as x increases, y increases B. as x decreases, y decreases C. as x increases, y decreases D. both A and B 7. When deciding which measure of correlation to employ with a specific set of data, you should consider: C. both A and B D. neither A nor B A. The type of level of measurement for each variable. B. The kind of association between the variables. 8. Of the following measurement levels, which is at a minimum required for the valid calculation of a Pearson correlation coefficient? A. nominal B. ordinal C. interval D. ratio 9. Which of the following statements is false? A. The range of the correlation coefficient is from -1 to +1. B. Spearman 's rho is used when one or both variables are at least of ordinal scaling. C. A correlation coefficient of -0.8 represents a higher degree of association between two variables than a correlation coefficient of +0.6. D. Negative correlation implies that low scores on one variable are related to low scores on another variable. 10. The lowest strength of association is reflected by which of the following correlation coefficients? A. 0.95 В. - 0.60 C. -0.33 D. 0.29
Transcribed Image Text:Choose the letter of the correct answer to the question 1. You are told that there is a high inverse association between the variables “ amount of exercise" and " incidence of heart disease ". A correlation coefficient consistent with the given statement is: A. r= 0.8 B.r= 0.2 C.r= -0.2 D.r= -0.8 2. Which among the given correlation coefficients shows the highest strength of association between variables? C.0.1 В. -0.95 А. -1.0 D. 0.88 3. If the relationship between x and y is positive, as variable y decreases, variable x: B. decreases A. increases C. remains the same D. equals zero 4. Of the following measurement levels, which is required for the valid calculation of the Spearman correlation coefficient? A. nominal B. ordinal C. interval D. ratio 5. Professor Bill obtained a correlation of -0.85 between body weight and IQ. This means that: A. Obesity decreases intelligence. B. Heavy people have higher IQs than light people. C. People with high IQs are likely to be light. D. Malnutrition damages the brain. 6. In a " negative * relationship: A. as x increases, y increases B. as x decreases, y decreases C. as x increases, y decreases D. both A and B 7. When deciding which measure of correlation to employ with a specific set of data, you should consider: C. both A and B D. neither A nor B A. The type of level of measurement for each variable. B. The kind of association between the variables. 8. Of the following measurement levels, which is at a minimum required for the valid calculation of a Pearson correlation coefficient? A. nominal B. ordinal C. interval D. ratio 9. Which of the following statements is false? A. The range of the correlation coefficient is from -1 to +1. B. Spearman 's rho is used when one or both variables are at least of ordinal scaling. C. A correlation coefficient of -0.8 represents a higher degree of association between two variables than a correlation coefficient of +0.6. D. Negative correlation implies that low scores on one variable are related to low scores on another variable. 10. The lowest strength of association is reflected by which of the following correlation coefficients? A. 0.95 В. - 0.60 C. -0.33 D. 0.29
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