Question 1

A correlation coefficient expresses quantitatively the degree of relationship between two variables.

Accepted Answer

A) True 
 B)False

Question 2

If scores are z scores and if r equals 1 then zX will always equal zY .

Accepted Answer

A) True 
 B)False

Question 3

Assuming a correlation exists, as the range of one of the variables decreases, r increases.

Accepted Answer

A) True 
 B)False

Question 4

r 2 is called the coefficient of determination.

Accepted Answer

A) True 
 B)False

Question 5

What is the slope for the points X 1 = 30, Y 1 = 50 and X 2 = 25 and Y 2 = 40?

Accepted Answer

A)   2.00
B)   0.50
C)   - 2.00
D)   - 0.50E) All of the above
F) B) and C)

Question 6

Calculate the Pearson r for the following set of data:

Accepted Answer

The answer of Calculate the Pearson r for the following...

Question 7

You have conducted a brilliant study which correlates IQ score with income and find a value of r = 0.75. At the end of the study you find out all the IQ scores were scored 10 points too high. What will the value of r be with the corrected data?

Accepted Answer

A)   r will be increased
B)   r will be decreased
C)   r will remain the same
D)   cannot be determinedE) All of the above
F) C) and D)

Question 8

A correlation coefficient expresses the direction but not the magnitude of a relationship.

Accepted Answer

A) True 
 B)False

Question 9

In a perfect relationship, _________.

Accepted Answer

A)   all the points fall on the line
B)   none of the points fall on the line
C)   some of the points fall on the line
D)   the points form an ellipse around the lineE) All of the above
F) A) and D)

Question 10

If the correlation between two variables is - 1.00 and the score of a given individual is 2.20 standard deviations above the mean on one of the variables, we would predict a score on the second variable of _________.

Accepted Answer

A)   2.20 standard deviations below the mean
B)   2.20 standard deviations above the mean
C)   more than 2.20 standard deviations above the mean
D)   more than 2.20 standard deviations below the meanE) A) and D)
F) A) and C)

Question 11

If one calculates r for a set of data and r equals 0.84, one can be certain that the relationship between the variables is not spurious.

Accepted Answer

A) True 
 B)False

Question 12

One reason for calculating r from z scores is to make r independent of units and scaling.

Accepted Answer

A) True 
 B)False  True

Question 13

Define Y intercept.

Accepted Answer

The Y-intercept of a line is the point where the line crosses the Y-axis on a Cartesian coordinate system. In other words, it is the value of Y at which the line intersects the Y-axis. This occurs when the value of the X-coordinate is zero.

To find the Y-intercept algebraically, you can look at the equation of a line. For a linear equation in slope-intercept form, which is written as y = mx + b, the Y-intercept is represented by the value of 'b'. Here, 'm' stands for the slope of the line, and 'b' is the point where the line crosses the Y-axis.

For example, if you have the equation y = 3x + 2, the Y-intercept is 2. This means that the line crosses the Y-axis at the point (0, 2).

In the context of a graph, the Y-intercept is important because it gives you a starting point for drawing the line when graphing the equation. It is also a key element in understanding the behavior of the line, as it indicates the value of the dependent variable (Y) when the independent variable (X) is zero.

Question 14

Knowing nothing more than that IQ and memory scores are correlated 0.84, you could validly conclude that _________.

Accepted Answer

A)   good memory causes high IQ
B)   high IQ causes good memory
C)   neither good memory nor high IQ cause each other
D)   a third variable causes both good memory and high IQ
E)   none of theseF) A) and B)
G) D) and E) A

Question 15

Rho is used where one or both variables are at least of interval scaling.

Accepted Answer

A) True 
 B)False

Question 16

If two variables are ratio scaled and the relationship is linear, what type of correlation coefficient is most appropriate?

Accepted Answer

A)   Pearson r
B)   Spearman rho
C)   eta
D)   phiE) A) and D)
F) B) and C)

Question 17

The correlation coefficient between heights from the ground of two people on the opposite ends of a seesaw would be _________.

Accepted Answer

A)   1.0
B)   0
C)   - 1.0
D)   cannot tell without further informationE) None of the above
F) B) and D)

Question 18

Define biserial coefficient.

Accepted Answer

The biserial correlation coefficient is ...

Question 19

The value of r obtained by calculating the correlation between X and Y is the same as the correlation between Y and X .

Accepted Answer

A) True 
 B)False

Question 20

A researcher wanted to know if the order in which runners finish a race is correlated with their weight. She conducts an experiment and the data are given below.  The correlation for these data equals _________.

Accepted Answer

A)   0.31
B)   0.32
C)   0.41
D)   0.45E) None of the above
F) B) and C)

Exam 6: Correlation

A correlation coefficient expresses quantitatively the degree of relationship between two variables.

Correct Answer
verified

If scores are z scores and if r equals 1 then zX will always equal zY .

Correct Answer
verified

Assuming a correlation exists, as the range of one of the variables decreases, r increases.

Correct Answer
verified

r ² is called the coefficient of determination.

Correct Answer
verified

What is the slope for the points X 1 = 30, Y 1 = 50 and X 2 = 25 and Y 2 = 40?

Correct Answer
verified

Calculate the Pearson r for the following set of data:

Correct Answer
verified

You have conducted a brilliant study which correlates IQ score with income and find a value of r = 0.75. At the end of the study you find out all the IQ scores were scored 10 points too high. What will the value of r be with the corrected data?

Correct Answer
verified

A correlation coefficient expresses the direction but not the magnitude of a relationship.

Correct Answer
verified

In a perfect relationship, _________.

Correct Answer
verified

If the correlation between two variables is - 1.00 and the score of a given individual is 2.20 standard deviations above the mean on one of the variables, we would predict a score on the second variable of _________.

Correct Answer
verified

If one calculates r for a set of data and r equals 0.84, one can be certain that the relationship between the variables is not spurious.

Correct Answer
verified

One reason for calculating r from z scores is to make r independent of units and scaling.

Correct Answer
verified
True

Define Y intercept.

Knowing nothing more than that IQ and memory scores are correlated 0.84, you could validly conclude that _________.

Correct Answer
verified
A

Rho is used where one or both variables are at least of interval scaling.

Correct Answer
verified

If two variables are ratio scaled and the relationship is linear, what type of correlation coefficient is most appropriate?

Correct Answer
verified

The correlation coefficient between heights from the ground of two people on the opposite ends of a seesaw would be _________.

Correct Answer
verified

Define biserial coefficient.

Correct Answer
Answered by ExamLex AI
The biserial correlation coefficient is ...
View Answer

The value of r obtained by calculating the correlation between X and Y is the same as the correlation between Y and X .

Correct Answer
verified

A researcher wanted to know if the order in which runners finish a race is correlated with their weight. She conducts an experiment and the data are given below. The correlation for these data equals _________.

Correct Answer
verified

Exam 6: Correlation

A correlation coefficient expresses quantitatively the degree of relationship between two variables.

Correct AnswerverifiedShow Answer

If scores are z scores and if r equals 1 then zX will always equal zY .

Correct AnswerverifiedShow Answer

Assuming a correlation exists, as the range of one of the variables decreases, r increases.

Correct AnswerverifiedShow Answer

r 2 is called the coefficient of determination.

Correct AnswerverifiedShow Answer

What is the slope for the points X 1 = 30, Y 1 = 50 and X 2 = 25 and Y 2 = 40?

Correct AnswerverifiedShow Answer

Calculate the Pearson r for the following set of data:

Correct AnswerverifiedShow Answer

You have conducted a brilliant study which correlates IQ score with income and find a value of r = 0.75. At the end of the study you find out all the IQ scores were scored 10 points too high. What will the value of r be with the corrected data?

Correct AnswerverifiedShow Answer

A correlation coefficient expresses the direction but not the magnitude of a relationship.

Correct AnswerverifiedShow Answer

In a perfect relationship, _________.

Correct AnswerverifiedShow Answer

If the correlation between two variables is - 1.00 and the score of a given individual is 2.20 standard deviations above the mean on one of the variables, we would predict a score on the second variable of _________.

Correct AnswerverifiedShow Answer

If one calculates r for a set of data and r equals 0.84, one can be certain that the relationship between the variables is not spurious.

Correct AnswerverifiedShow Answer

One reason for calculating r from z scores is to make r independent of units and scaling.

Correct AnswerverifiedTrue

Define Y intercept.

Knowing nothing more than that IQ and memory scores are correlated 0.84, you could validly conclude that _________.

Correct AnswerverifiedA

Rho is used where one or both variables are at least of interval scaling.

Correct AnswerverifiedShow Answer

If two variables are ratio scaled and the relationship is linear, what type of correlation coefficient is most appropriate?

Correct AnswerverifiedShow Answer

The correlation coefficient between heights from the ground of two people on the opposite ends of a seesaw would be _________.

Correct AnswerverifiedShow Answer

Define biserial coefficient.

Correct AnswerAnswered by ExamLex AIThe biserial correlation coefficient is ...View AnswerShow Answer

The value of r obtained by calculating the correlation between X and Y is the same as the correlation between Y and X .

Correct AnswerverifiedShow Answer

A researcher wanted to know if the order in which runners finish a race is correlated with their weight. She conducts an experiment and the data are given below. The correlation for these data equals _________.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

r ² is called the coefficient of determination.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
True

Correct Answer
verified
A

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The biserial correlation coefficient is ...
View Answer

Correct Answer
verified

Correct Answer
verified