The correlation coefficient, rho: Select one: a. None of the given answers. b. Has the same...
The correlation coefficient, rho: Select one: a. None of the given answers. b. Has the same sign as covariance, and is normalized between negative infinity and positive infinity. c. Has the opposite sign as the covariance and is non-normalized. d. Has the opposite sign as covariance and is normalized between -1 and 1.
Homework Answers
The correlation coefficient, rho "has same sign as covariance and normalised between -1 and 1.Hence none of the given answers , option (a) is correct.
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The correlation coefficient, rho: Select one: a. None of the
given answers. b. Has the same...
Which of the following is the null hypothesis when you use the correlation coefficient? a. rho...
Which of the following is the null hypothesis when you use the correlation coefficient? a. rho = 0 b. there is a relationship between the two variables c. there is not a null hypothesis when you test the significance of r. d. The correlation will not be negative
Positive values of covariance indicate Select one: a positive vaffance of the x values O b....
Positive values of covariance indicate Select one: a positive vaffance of the x values O b. a positive variance of the y values C. the standard deviation is positive a positive relation between the x and te y variables The correlation coefficient Select one: is the same as the covariance cannot be negative C. can be larger than 1 cannot be larger than 1
Find the covariance and correlation coefficient for the following sets of data. Select the answers equal...
Find the covariance and correlation coefficient for the following sets of data. Select the answers equal to or closest to your results. X: 50 44 47 40 54 Y: 10 13 95 7 Cov What does each measure tell you? Check all that apply. The covariance tells you that there is a weak or nonexistent linear relationship between X and Y The covariance and correlation coefficient tell you that there is a positive linear relationship between X and Y. The...
If the coefficient of correlation is 0.84 the coefficient of determination is approximately select one: A....
If the coefficient of correlation is 0.84 the coefficient of determination is approximately select one: A. 0.3 B. 0.5 C. 0.7 D. none of the above
Which of the following is false? Correlation coefficient and the slope always have the same sign...
Which of the following is false? Correlation coefficient and the slope always have the same sign (positive or negative). If the correlation coefficient is 1, then the slope must be 1 as well. Correlation measures the strength of linear association between two numerical variables. If the correlation between two variables is close to 0.01, then there is a very weak linear relation between them.
Which of the following may have an adverse effect on a correlation coefficient? Select one: a....
Which of the following may have an adverse effect on a correlation coefficient? Select one: a. too many people in your experiment b. a negative relationship between your X and Y variables c. the scores on one variable have larger numbers than the other variable d. restricting the range of possible scores e. None
The correlation coefficient: A, Is a number with a range from -1 to 1 B. If...
The correlation coefficient: A, Is a number with a range from -1 to 1 B. If there is no correlation, the coefficient is negative C. If the correlation coefficient is negative, it indicates a strong positive relationship between x and y D. All of the above
4.he sample correlation coefficient between X and Y, rxy Sx/Sx S where S-the covariance between X...
4.he sample correlation coefficient between X and Y, rxy Sx/Sx S where S-the covariance between X and Ys Σ(X-XM) (-Yu)/ n-1 Sx the standard deviation of X and Sy the standard deviation of Y I) If the covariance is positive, the correlation coefficient must be positive: True or False? ii) If the covariance is negative, the correlation coefficient must be positive: True or False? a) ii) The correlation coefficient must lie between 0 and 1. True or False? v)lf the...
The correlation coefficient is a summary measure that Select one: a. is of limited use because...
The correlation coefficient is a summary measure that Select one: a. is of limited use because it fails to indicate the direction of the relationship between the variables. b. indicates the change in Y for a one unit change in X. c. indicates the strength of linear relationship between a pair of quantitative variables. d. indicates the proportion of variation in Y that is explained by the variation in X. e. none of the above. In regression analysis, the F...
1. Match the correlation coefficient to its variable. Population Correlation (choose below) a. c b. p...
1. Match the correlation coefficient to its variable.
Population Correlation (choose below)
a. c
b. p (Greek rho)
c. r
d.R
c. Greek alpha
Sample Correlation (choose below)
a. c
b. p (Greek rho)
c. r
d.R
c. Greek alpha
Question 7 1 pts Which of the correlation values represent a perfect linear relationship between x and y? 0-1 O1 0.05 100
Positive values of covariance indicate Select one: a positive vaffance of the x values O b. a positive variance of the y values C. the standard deviation is positive a positive relation between the x and te y variables The correlation coefficient Select one: is the same as the covariance cannot be negative C. can be larger than 1 cannot be larger than 1
Find the covariance and correlation coefficient for the following sets of data. Select the answers equal to or closest to your results. X: 50 44 47 40 54 Y: 10 13 95 7 Cov What does each measure tell you? Check all that apply. The covariance tells you that there is a weak or nonexistent linear relationship between X and Y The covariance and correlation coefficient tell you that there is a positive linear relationship between X and Y. The...
4.he sample correlation coefficient between X and Y, rxy Sx/Sx S where S-the covariance between X and Ys Σ(X-XM) (-Yu)/ n-1 Sx the standard deviation of X and Sy the standard deviation of Y I) If the covariance is positive, the correlation coefficient must be positive: True or False? ii) If the covariance is negative, the correlation coefficient must be positive: True or False? a) ii) The correlation coefficient must lie between 0 and 1. True or False? v)lf the...
1. Match the correlation coefficient to its variable.
Population Correlation (choose below)
a. c
b. p (Greek rho)
c. r
d.R
c. Greek alpha
Sample Correlation (choose below)
a. c
b. p (Greek rho)
c. r
d.R
c. Greek alpha
Question 7 1 pts Which of the correlation values represent a perfect linear relationship between x and y? 0-1 O1 0.05 100
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