Question 1

The scatter plot for a set of X and Y values shows the data points clustered in a nearly perfect circle.For these data,what is the most likely value for the correlation?​

Accepted Answer

A) a positive correlation near 0​ 
B) ​a negative correlation near 0 
C) ​either positive or negative near 0 
D) ​a value near +1.00 or 1.00 
A) a positive correlation near 0​ 
B) ​a negative correlation near 0 
C) ​either positive or negative near 0 
D) ​a value near +1.00 or 1.00

Question 2

For a two-tailed hypothesis test evaluating a Pearson correlation,what is stated by the null hypothesis?​

Accepted Answer

A) ​There is a non-zero correlation for the general population. 
B) ​The population correlation is zero. 
C) ​There is a non-zero correlation for the sample. 
D) ​The sample correlation is zero. 
A) ​There is a non-zero correlation for the general population. 
B) ​The population correlation is zero. 
C) ​There is a non-zero correlation for the sample. 
D) ​The sample correlation is zero.

Question 3

Under what circumstances is the phi-coefficient used?​

Accepted Answer

A) ​when one variable consists of ranks and the other is regular, numerical scores 
B) ​when both variables consists of ranks 
C) ​when both X and Y are dichotomous variables 
D) ​when one variable is dichotomous and the other is regular, numerical scores 
A) ​when one variable consists of ranks and the other is regular, numerical scores 
B) ​when both variables consists of ranks 
C) ​when both X and Y are dichotomous variables 
D) ​when one variable is dichotomous and the other is regular, numerical scores

Question 4

What would the scatterplot show for data that produce a correlation of +0.88?​

Accepted Answer

A) ​points clustered close to a line that slopes up to the right 
B) ​points clustered close to a line that slopes down to the right 
C) ​points widely scattered around a line that slopes up to the right 
D) ​points widely scattered around a line that slopes down to the right 
A) ​points clustered close to a line that slopes up to the right 
B) ​points clustered close to a line that slopes down to the right 
C) ​points widely scattered around a line that slopes up to the right 
D) ​points widely scattered around a line that slopes down to the right

Question 5

The results from a research study indicate that adolescents who watch more violent content on television also tend to engage in more violent behavior than their peers.The correlation between amount of TV violent content and amount of violent behavior is an example of a ____.​

Accepted Answer

A) ​positive correlation 
B) ​negative correlation 
C) ​correlation near zero 
D) ​correlation near one 
A) ​positive correlation 
B) ​negative correlation 
C) ​correlation near zero 
D) ​correlation near one

Question 6

Which correlation should be used to measure the relationship between gender and grade point average for a group of college students?​

Accepted Answer

A) ​Pearson correlation 
B) ​Spearman correlation 
C) ​point-biserial correlation 
D) ​phi-coefficient 
A) ​Pearson correlation 
B) ​Spearman correlation 
C) ​point-biserial correlation 
D) ​phi-coefficient

Question 7

Which of the following best describes the Pearson correlation for these data?? $$\begin{array} { l l } 
\mathrm { X } & \mathrm { Y } \
2 & 5 \
5 & 1 \
3 & 4 \
4 & 2 \
\hline
\end{array}$$

Accepted Answer

A) ?It is positive. 
B) ?It is negative. 
C) ?It is close to zero. 
D) ?It is equal to zero. 
A) ?It is positive. 
B) ?It is negative. 
C) ?It is close to zero. 
D) ?It is equal to zero.

Question 8

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

Accepted Answer

A) It will be positive.​ 
B) ​It will be negative and have a value of -1.00. 
C) ​It will be positive and have a value of 1.00. 
D) ​It will be negative. 
A) It will be positive.​ 
B) ​It will be negative and have a value of -1.00. 
C) ​It will be positive and have a value of 1.00. 
D) ​It will be negative.

Question 9

How large a sample is needed for a correlation of r = 0.550 to be significant using a two-tailed test with α = .05?​

Accepted Answer

A) ​n = 14 
B) ​n = 13 
C) ​n = 12 
D) ​n = 11 
A) ​n = 14 
B) ​n = 13 
C) ​n = 12 
D) ​n = 11

Question 10

If participants in a study are classified by age (over 30/under 30)and by political affiliation (Democrat/Republican),then the point-biserial correlation would be the proper technique to measure the relationship between the two variables.

Accepted Answer

A) True 
 B)False

Question 11

Suppose that the correlation between height and weight for adults is +0.40.What proportion (or percent)of the variability in weight can be explained by the relationship with height?​

Accepted Answer

A) ​40% 
B) ​60% 
C) ​16% 
D) ​84% 
A) ​40% 
B) ​60% 
C) ​16% 
D) ​84%

Question 12

A psychologist would like to evaluate the relationship between verbal skills as measured by the Scholastic Achievement Test (SAT)and performance on an anagram task.(Anagrams are words with the letters scrambled.The task is to unscramble the letters and identify the word.)Each subject is given a set of 10 anagrams,and the psychologist records how much time is needed to solve all 10.The anagram times and each subject's SAT score are as follows.(Note that two subjects failed to complete all 10 anagrams.)Use a Spearman correlation to measure and describe the relationship between SAT and anagram performance.​ $$\begin{array} { l l l } 
\text { Subject } & \begin{array} { l } 
\text { Anagram } \
\text { Time }
\end{array} & \begin{array} { l } 
\text { SAT } \
\text { Score }
\end{array} \
\hline 1 & 104 & 480 \
2 & 195 & 410 \
3 & 50 & 590 \
4 & 93 & 510 \
5 & \text { failed } & 420 \
6 & 170 & 460 \
7 & \text { failed } & 380 \
8 & 67 & 570 \
9 & 45 & 640 \
10 & 58 & 600
\end{array}$$

Accepted Answer

After ranking the data for SAT

Question 13

What is the value of SP for the following set of data?? $$\begin{array} { l l } 
X & Y \
4 & 3 \
1 & 2 \
1 & 5 \
2 & 6 \
\hline
\end{array}$$

Accepted Answer

A) -1? 
B) ?-5 
C) ?5 
D) ?1 
A) -1? 
B) ?-5 
C) ?5 
D) ?1

Question 14

If the value of the Pearson correlation between two variables is r = +1.00 or 1.00,then all data points in a scatter plot will fit perfectly on a straight line.

Accepted Answer

A) True 
 B)False

Question 15

The value for the sum of products (SP)is always greater than or equal to zero.

Accepted Answer

A) True 
 B)False

Question 16

If the Pearson correlation is calculated for a sample of n = 20 individuals,what value for df should be used to determine whether or not the correlation is significant?​

Accepted Answer

A) ​18 
B) ​19 
C) ​20 
D) ​21 
A) ​18 
B) ​19 
C) ​20 
D) ​21

Question 17

A set of n = 5 pairs of X and Y scores has ΣX = 15,ΣY = 5,and ΣXY = 10.For these data,the value of SP is ____.​

Accepted Answer

A) -5​ 
B) ​5 
C) ​10 
D) ​25 
A) -5​ 
B) ​5 
C) ​10 
D) ​25

Question 18

The numerical value for a correlation can ____.​

Accepted Answer

A) never be greater than 1.00​ 
B) ​never be less than 1.00 
C) ​never be greater than 1.00 and can never be less than -1.00 
D) ​be greater than 1.00 and can be less than -1.00 
A) never be greater than 1.00​ 
B) ​never be less than 1.00 
C) ​never be greater than 1.00 and can never be less than -1.00 
D) ​be greater than 1.00 and can be less than -1.00

Question 19

A correlation of +0.95 means that there is essentially no consistent relationship between X and Y.

Accepted Answer

A) True 
 B)False

Question 20

What is the value of SP for the following set of data?? $$\begin{array} { l l } 
\mathrm { X } & \mathrm { Y } \
\hline 1 & 4 \
2 & 4 \
9 & 1 \
\hline
\end{array}$$

Accepted Answer

A) ?-5 
B) ?5 
C) ?-15 
D) ?15 
A) ?-5 
B) ?5 
C) ?-15 
D) ?15

The scatter plot for a set of X and Y values shows the data points clustered in a nearly perfect circle.For these data,what is the most likely value for the correlation?

For a two-tailed hypothesis test evaluating a Pearson correlation,what is stated by the null hypothesis?

Under what circumstances is the phi-coefficient used?

What would the scatterplot show for data that produce a correlation of +0.88?

The results from a research study indicate that adolescents who watch more violent content on television also tend to engage in more violent behavior than their peers.The correlation between amount of TV violent content and amount of violent behavior is an example of a ____.

Which correlation should be used to measure the relationship between gender and grade point average for a group of college students?

Which of the following best describes the Pearson correlation for these data?? 2 5 5 1 3 4 4 2

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

How large a sample is needed for a correlation of r = 0.550 to be significant using a two-tailed test with α = .05?

If participants in a study are classified by age (over 30/under 30)and by political affiliation (Democrat/Republican),then the point-biserial correlation would be the proper technique to measure the relationship between the two variables.

Suppose that the correlation between height and weight for adults is +0.40.What proportion (or percent)of the variability in weight can be explained by the relationship with height?

What is the value of SP for the following set of data?? X Y 4 3 1 2 1 5 2 6

If the value of the Pearson correlation between two variables is r = +1.00 or 1.00,then all data points in a scatter plot will fit perfectly on a straight line.

The value for the sum of products (SP)is always greater than or equal to zero.

If the Pearson correlation is calculated for a sample of n = 20 individuals,what value for df should be used to determine whether or not the correlation is significant?

A set of n = 5 pairs of X and Y scores has ΣX = 15,ΣY = 5,and ΣXY = 10.For these data,the value of SP is ____.

The numerical value for a correlation can ____.

A correlation of +0.95 means that there is essentially no consistent relationship between X and Y.

What is the value of SP for the following set of data?? 1 4 2 4 9 1

Introduction to Statistics

Frequency Distributions

Central Tendency

Variability

Z-Scores: Location of Scores and Standardized Distributions

Probability

Probability and Samples: the Distribution of Sample Means

Introduction to Hypothesis Testing

Introduction to the T Statistic

The T Test for Two Independent Samples

The T Test for Two Related Samples

Introduction to Analysis of Variance

Repeated-Measures Analysis of Variance Anova

Two-Factor Analysis of Variance Independent Measures

Introduction to Regression

The Chi-Square Statistic: Tests for Goodness of Fit and Independence

The Binomial Test

Filters

Exam 15: Correlation

The scatter plot for a set of X and Y values shows the data points clustered in a nearly perfect circle.For these data,what is the most likely value for the correlation?​

For a two-tailed hypothesis test evaluating a Pearson correlation,what is stated by the null hypothesis?​

Under what circumstances is the phi-coefficient used?​

What would the scatterplot show for data that produce a correlation of +0.88?​

The results from a research study indicate that adolescents who watch more violent content on television also tend to engage in more violent behavior than their peers.The correlation between amount of TV violent content and amount of violent behavior is an example of a ____.​

Which correlation should be used to measure the relationship between gender and grade point average for a group of college students?​

Which of the following best describes the Pearson correlation for these data?? 2 5 5 1 3 4 4 2

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

How large a sample is needed for a correlation of r = 0.550 to be significant using a two-tailed test with α = .05?​

If participants in a study are classified by age (over 30/under 30)and by political affiliation (Democrat/Republican),then the point-biserial correlation would be the proper technique to measure the relationship between the two variables.

Suppose that the correlation between height and weight for adults is +0.40.What proportion (or percent)of the variability in weight can be explained by the relationship with height?​

What is the value of SP for the following set of data?? X Y 4 3 1 2 1 5 2 6

If the value of the Pearson correlation between two variables is r = +1.00 or 1.00,then all data points in a scatter plot will fit perfectly on a straight line.

The value for the sum of products (SP)is always greater than or equal to zero.

If the Pearson correlation is calculated for a sample of n = 20 individuals,what value for df should be used to determine whether or not the correlation is significant?​

A set of n = 5 pairs of X and Y scores has ΣX = 15,ΣY = 5,and ΣXY = 10.For these data,the value of SP is ____.​

The numerical value for a correlation can ____.​

A correlation of +0.95 means that there is essentially no consistent relationship between X and Y.

What is the value of SP for the following set of data?? 1 4 2 4 9 1

Introduction to Statistics

Frequency Distributions

Central Tendency

Variability

Z-Scores: Location of Scores and Standardized Distributions

Probability

Probability and Samples: the Distribution of Sample Means

Introduction to Hypothesis Testing

Introduction to the T Statistic

The T Test for Two Independent Samples

The T Test for Two Related Samples

Introduction to Analysis of Variance

Repeated-Measures Analysis of Variance Anova

Two-Factor Analysis of Variance Independent Measures

Introduction to Regression

The Chi-Square Statistic: Tests for Goodness of Fit and Independence

The Binomial Test

Filters

The scatter plot for a set of X and Y values shows the data points clustered in a nearly perfect circle.For these data,what is the most likely value for the correlation?

For a two-tailed hypothesis test evaluating a Pearson correlation,what is stated by the null hypothesis?

Under what circumstances is the phi-coefficient used?

What would the scatterplot show for data that produce a correlation of +0.88?

The results from a research study indicate that adolescents who watch more violent content on television also tend to engage in more violent behavior than their peers.The correlation between amount of TV violent content and amount of violent behavior is an example of a ____.

Which correlation should be used to measure the relationship between gender and grade point average for a group of college students?

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

How large a sample is needed for a correlation of r = 0.550 to be significant using a two-tailed test with α = .05?

Suppose that the correlation between height and weight for adults is +0.40.What proportion (or percent)of the variability in weight can be explained by the relationship with height?

If the Pearson correlation is calculated for a sample of n = 20 individuals,what value for df should be used to determine whether or not the correlation is significant?

A set of n = 5 pairs of X and Y scores has ΣX = 15,ΣY = 5,and ΣXY = 10.For these data,the value of SP is ____.

The numerical value for a correlation can ____.