Homework Answers
[1] r = -0.15 = [C] a weak negative relationship between x and y.
[2] r= 0 = [B] no relationship between x and y.
[3] r=1 = [D] Perfect positive relationship between x and y.
[4] r= -0.97 = [A] Strong negavtie relationship between x and y.
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(8 points) Match the following sample correlation coefficients with the explanation of what that correlation coefficient...
1. construct a scatter plot for the variables 2. compute the value of the correlation coefficient...
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The correlation coefficient: A, Is a number with a range from -1 to 1 B. If...
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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
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If a researcher obtained an r of -0.85, what could you say about this correlation? -...
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Let r be the correlation coefficient. Denote the explanatory variable by X and the responsible variable...
Let r be the correlation coefficient. Denote the explanatory variable by X and the responsible variable by Y . Which statement is correct ? (A) Positive r indicates a perfect linear relationship between X and Y . (B) r is always a number between 0 and 1. (C) r is almost 0 if values of X’s and Y ’s are all positive. (D) The correlation of variables −X and Y is −r. (E) None of the above.
For the following data (a) display the data in a scatter plot, (b) calculate the correlation...
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correlation measures the degree to which two variables are related to one another. Here are the...
correlation measures the degree to which two variables are related to one another. Here are the definitions of the three possibilities: Positive correlations: In this type of correlation, both variables increase or decrease at the same time. A correlation coefficient close to +1.00 indicates a strong positive correlation. Negative correlations: This type of correlation indicates that as the amount of one variable increases, the other decreases (and vice versa). A correlation coefficient close to -1.00 indicates a strong negative correlation....
Which of the following are true statements about the correlation coefficient r? I. A correlation coefficient...
Which of the following are true statements about the correlation coefficient r? I. A correlation coefficient of .3 means that 30% of the points are highly correlated. II. The square of the correlation measures the proportion of the y-variance that is predictable from a knowledge of x. III. Perfect correlation, that is, when the points lie exactly on a straight line is r = 0.
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...
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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