Question 1

​The sign of the correlation (+/)is generally meaningless for the point-biserial correlation and the phi-coefficient.

Accepted Answer

A) True 
 B)False

Question 2

A scatter plot shows data points that are widely scattered around a line that slopes down to the right.Which value would be closest to the correlation for these data?​

Accepted Answer

A) ​-0.80 
B) -0.40 
C) ​0.40 
D) ​0.80

Question 3

A Pearson correlation is computed for a sample of n = 18 pairs of X and Y values.What correlations are statistically significant with α = .05,two tails?​

Accepted Answer

A) ​correlations between 0.468 and -0.468 
B) ​correlations greater than or equal to 0.468 and correlation less than or equal to -0.468 
C) ​correlations between 0.456 and -0.456 
D) ​correlations greater than or equal to 0.456 and correlation less than or equal to -0.456

Question 4

The Pearson and the Spearman correlations are both computed for the same set of data.If the Pearson correlation is r = +1.00,then what can you conclude about the Spearman correlation?​

Accepted Answer

A) ​It will be negative. 
B) ​It will have a value of -1.00. 
C) ​It will be positive and have a value of 1.00. 
D) ​There is no predictable relationship between the Pearson and the Spearman correlations.

Question 5

A correlation of +0.90 indicates that the data points are clustered close to a line that slopes down to the right.

Accepted Answer

A) True 
 B)False

Question 6

Describe what is meant by a negative relationship and a positive relationship between two variables.

Accepted Answer

The answer of Describe what is meant by a negative...

Question 7

Compute the Pearson correlation for the following data.​ $$\begin{array} { l l } 
\mathrm { X } & \mathrm { Y } \
\hline 2 & 3 \
3 & 1 \
6 & 5 \
4 & 4 \
5 & 2
\end{array}$$

Accepted Answer

The answer of Compute the Pearson correlation for the following...

Question 8

A researcher obtains SSX = 20,SSY = 5,and SP = 7 for a set of n = 25 pairs of scores.The Pearson correlation for these scores is r = 7/10 = 0.70.

Accepted Answer

A) True 
 B)False

Question 9

The effect size for the data from an independent-measures t test can be measured by r2.Which of the following also produces the value for r2?​

Accepted Answer

A) ​squaring the Spearman correlation for the same data 
B) ​squaring the point-biserial correlation for the same data 
C) ​squaring the Pearson correlation for the same data 
D) ​taking the square root of the Pearson correlation

Question 10

A researcher classifies people by gender and by whether or not they routinely watch the evening news on television.For the resulting data,the correct method for measuring the relationship between the two variables would be the phi-coefficient.

Accepted Answer

A) True 
 B)False

Question 11

For a positive correlation,decreases in X tend to be accompanied by decreases in Y.

Accepted Answer

A) True 
 B)False

Question 12

The Spearman correlation can be +1.00 or 1.00 even when there is no linear relationship between the two variables.

Accepted Answer

A) True 
 B)False

Question 13

A negative correlation means that decreases in the X variable tend to be accompanied by decreases in the Y variable.

Accepted Answer

A) True 
 B)False

Question 14

Suppose that there is a correlation of +0.41 between the amount of time that each student spends on social media and the student's grade on the exam.This correlation clearly indicates that people who spend more time on social media receive better grades.

Accepted Answer

A) True 
 B)False

Question 15

A researcher obtains a Pearson correlation of r = 0.43 for a sample of n = 20 participants.For a two-tailed test,which of the following accurately describes the significance of the correlation?​

Accepted Answer

A) ​The correlation is significant with α = .05 but not with α = .01. 
B) ​The correlation is significant with either α = .05 or α = .01. 
C) ​The correlation is not significant with either α = .05 or α = .01. 
D) ​The correlation is equal to zero.

Question 16

Which correlation value shows the greatest strength or consistency of relationship?​

Accepted Answer

A) -0.90​ 
B) ​+0.74 
C) ​+0.85 
D) ​-0.33

Exam 15: Correlation

The sign of the correlation (+/)is generally meaningless for the point-biserial correlation and the phi-coefficient.

A scatter plot shows data points that are widely scattered around a line that slopes down to the right.Which value would be closest to the correlation for these data?

A Pearson correlation is computed for a sample of n = 18 pairs of X and Y values.What correlations are statistically significant with α = .05,two tails?

The Pearson and the Spearman correlations are both computed for the same set of data.If the Pearson correlation is r = +1.00,then what can you conclude about the Spearman correlation?

A correlation of +0.90 indicates that the data points are clustered close to a line that slopes down to the right.

Describe what is meant by a negative relationship and a positive relationship between two variables.

Compute the Pearson correlation for the following data. $\begin{array} { l l } \mathrm { X } & \mathrm { Y } \\\hline 2 & 3 \\3 & 1 \\6 & 5 \\4 & 4 \\5 & 2\end{array}$

A researcher obtains SS_X = 20,SS_Y = 5,and SP = 7 for a set of n = 25 pairs of scores.The Pearson correlation for these scores is r = 7/10 = 0.70.

The effect size for the data from an independent-measures t test can be measured by r².Which of the following also produces the value for r²?

A researcher classifies people by gender and by whether or not they routinely watch the evening news on television.For the resulting data,the correct method for measuring the relationship between the two variables would be the phi-coefficient.

For a positive correlation,decreases in X tend to be accompanied by decreases in Y.

The Spearman correlation can be +1.00 or 1.00 even when there is no linear relationship between the two variables.

A negative correlation means that decreases in the X variable tend to be accompanied by decreases in the Y variable.

Suppose that there is a correlation of +0.41 between the amount of time that each student spends on social media and the student's grade on the exam.This correlation clearly indicates that people who spend more time on social media receive better grades.

A researcher obtains a Pearson correlation of r = 0.43 for a sample of n = 20 participants.For a two-tailed test,which of the following accurately describes the significance of the correlation?

Which correlation value shows the greatest strength or consistency of relationship?

Exam 15: Correlation

​The sign of the correlation (+/)is generally meaningless for the point-biserial correlation and the phi-coefficient.

A scatter plot shows data points that are widely scattered around a line that slopes down to the right.Which value would be closest to the correlation for these data?​

A Pearson correlation is computed for a sample of n = 18 pairs of X and Y values.What correlations are statistically significant with α = .05,two tails?​

The Pearson and the Spearman correlations are both computed for the same set of data.If the Pearson correlation is r = +1.00,then what can you conclude about the Spearman correlation?​

A correlation of +0.90 indicates that the data points are clustered close to a line that slopes down to the right.

Describe what is meant by a negative relationship and a positive relationship between two variables.

Compute the Pearson correlation for the following data.​ XY2331654452\begin{array} { l l } \mathrm { X } & \mathrm { Y } \\\hline 2 & 3 \\3 & 1 \\6 & 5 \\4 & 4 \\5 & 2\end{array}X23645​Y31542​​

A researcher obtains SSX = 20,SSY = 5,and SP = 7 for a set of n = 25 pairs of scores.The Pearson correlation for these scores is r = 7/10 = 0.70.

The effect size for the data from an independent-measures t test can be measured by r2.Which of the following also produces the value for r2?​

A researcher classifies people by gender and by whether or not they routinely watch the evening news on television.For the resulting data,the correct method for measuring the relationship between the two variables would be the phi-coefficient.

For a positive correlation,decreases in X tend to be accompanied by decreases in Y.

The Spearman correlation can be +1.00 or 1.00 even when there is no linear relationship between the two variables.

A negative correlation means that decreases in the X variable tend to be accompanied by decreases in the Y variable.

Suppose that there is a correlation of +0.41 between the amount of time that each student spends on social media and the student's grade on the exam.This correlation clearly indicates that people who spend more time on social media receive better grades.

A researcher obtains a Pearson correlation of r = 0.43 for a sample of n = 20 participants.For a two-tailed test,which of the following accurately describes the significance of the correlation?​

Which correlation value shows the greatest strength or consistency of relationship?​

The sign of the correlation (+/)is generally meaningless for the point-biserial correlation and the phi-coefficient.

A scatter plot shows data points that are widely scattered around a line that slopes down to the right.Which value would be closest to the correlation for these data?

A Pearson correlation is computed for a sample of n = 18 pairs of X and Y values.What correlations are statistically significant with α = .05,two tails?

The Pearson and the Spearman correlations are both computed for the same set of data.If the Pearson correlation is r = +1.00,then what can you conclude about the Spearman correlation?

Compute the Pearson correlation for the following data. $\begin{array} { l l } \mathrm { X } & \mathrm { Y } \\\hline 2 & 3 \\3 & 1 \\6 & 5 \\4 & 4 \\5 & 2\end{array}$

A researcher obtains SS_X = 20,SS_Y = 5,and SP = 7 for a set of n = 25 pairs of scores.The Pearson correlation for these scores is r = 7/10 = 0.70.

The effect size for the data from an independent-measures t test can be measured by r².Which of the following also produces the value for r²?

A researcher obtains a Pearson correlation of r = 0.43 for a sample of n = 20 participants.For a two-tailed test,which of the following accurately describes the significance of the correlation?

Which correlation value shows the greatest strength or consistency of relationship?