1. The correlation coefficient measures ...

Select one:

a. the magnitude of the relationship between two variables

b. the magnitude relationship between various variables

c. the magnitude relationship between two variables

d. the magnitude of the relationship between various variables

2.Linear correlation analysis is a technique that seeks to determine ...

Select one:

a. the relationship of the covariation between two variables

b. a number that indicates the variation between two variables

c. a number that indicates the covariation between two variables

d. the relationship of the variation between two variables

3. The correlation coefficient and the determination coefficient are related in a way ...

Select one:

a. linear

b. quadratic

c. punctual

d. sample

4. Suppose that in a given study, correlation coefficients of 0.3 and 0.6 are obtained for variables A and B; and C and D, respectively. So it is possible to state that ...

Select one:

a. variables C and D are more related to the study than variables A and B

b. the relationship between variables C and D is twice the relationship between variables A and B

c. the relationship between variables C and D is greater than the relationship between variables A and B

d. variables C and D are more relevant to the study than variables A and B

5. Linear correlation analysis answers all of the following questions EXCEPT ....

Select one:

a. Are the variables closely related?

b. Is the relationship between the variables negative?

c. Is the observed association null?

d. Is the observed association causal?

6. All of the following are characteristics of the correlation coefficient EXCEPT ....

Select one:

a. is located in the interval [-1,1]

b. used in both linear and nonlinear regression analysis

c. does not depend on any unit of measure

d. is an indicator of the density around the regression line

7. Linear correlation analysis is used when ...

Select one:

a. it has been determined that there is a linear relationship between two variables

b. you want to determine there is a quantitative relationship between two variables

c. the magnitude of the linear relationship between two variables has been determined

d. you want to determine if there is a linear relationship between two variables

8. In the image below, interpret the comment regarding the correlation ....

After interviewing thousands of people, I have found a strong correlation between being smart and agreeing with me