Question 1

If the data points in a scatter plot show a nearly circular pattern,then the correlation is near zero.

Accepted Answer

A) True 
 B)False

Question 2

As the sample size gets larger,what happens to the size of the correlation that is needed for significance?​

Accepted Answer

A) ​It also gets larger. 
B) ​It gets smaller. 
C) ​It stays constant. 
D) ​There is no consistent relationship between sample size and the critical value for a significant correlation. 
A) ​It also gets larger. 
B) ​It gets smaller. 
C) ​It stays constant. 
D) ​There is no consistent relationship between sample size and the critical value for a significant correlation.

Question 3

A researcher measures IQ and weight for a group of college students.What kind of correlation is likely to be obtained for these two variables?​

Accepted Answer

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

Question 4

If you measured hearing acuity and age for a group of people who are 50 to 90 years old,you should obtain a negative correlation between the two variables.

Accepted Answer

A) True 
 B)False

Question 5

The phi-coefficient is used to measure relationships for data that would also be appropriate for an independent-measures t test.

Accepted Answer

A) True 
 B)False

Question 6

There is a statistical technique,known as partial correlation,which allows a researcher to measure the relationship between two variables while eliminating or holding constant the influence of a third variable.

Accepted Answer

A) True 
 B)False

Question 7

A researcher records the odometer reading and age of used Hondas.What kind of correlation is likely to be obtained for these two variables?​

Accepted Answer

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

Question 8

For a group of graduating college seniors,a researcher records each student's rank in his/her high school graduating class and the student's rank in the college graduating class.Which correlation should be used to measure the relationship between these two variables?​

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 9

A set of n = 10 pairs of scores has ΣX = 20,ΣY = 30,and ΣXY = 74.What is the value of SP for these data?​

Accepted Answer

A) 74​ 
B) ​24 
C) ​14 
D) ​-14 
A) 74​ 
B) ​24 
C) ​14 
D) ​-14

Question 10

If the Pearson correlation for a set of scores is equal to +1.00,then the Spearman correlation for the same scores would also be equal to +1.00.

Accepted Answer

A) True 
 B)False

Question 11

Whenever a correlation is computed from scores that do not represent the full range of possible values,one is working with a restricted range and caution should be used when interpreting the correlation.

Accepted Answer

A) True 
 B)False

Question 12

A set of n = 15 pairs of scores (X and Y values)produces a correlation of r = 0.40.If each of the X values is multiplied by 2 and the correlation is computed for the new scores,what value will be obtained for the new correlation?​

Accepted Answer

A) ​r = 0.20 
B) ​r = 0.40 
C) ​r = 0.80 
D) ​This cannot be determined without knowing all the X and Y scores. 
A) ​r = 0.20 
B) ​r = 0.40 
C) ​r = 0.80 
D) ​This cannot be determined without knowing all the X and Y scores.

Question 13

Using a two-tailed test with α = .05,a sample correlation of r = 0.355 for a sample of n = 30 individuals is large enough to conclude that there is a real correlation in the general population.​

Accepted Answer

A) True 
 B)False

Question 14

A set of n = 5 pairs of X and Y values has SSX = 16,SSY = 4 and SP = 2.For these data,the Pearson correlation is ____.​

Accepted Answer

A) ​r = 2/64 
B) ​r = 2/8 
C) ​r = 8/8 
D) ​r = 64/8 
A) ​r = 2/64 
B) ​r = 2/8 
C) ​r = 8/8 
D) ​r = 64/8

Question 15

​Which of the following sets of correlations is correctly ordered from the highest to the lowest degree of relationship?

Accepted Answer

A) ​0.91, +0.83, +0.10, 0.03 
B) ​0.91, +0.83, 0.03, 0.10 
C) ​+0.83, +0.10, 0.91, 0.03 
D) ​+0.83, +0.10, 0.03, 0.91 
A) ​0.91, +0.83, +0.10, 0.03 
B) ​0.91, +0.83, 0.03, 0.10 
C) ​+0.83, +0.10, 0.91, 0.03 
D) ​+0.83, +0.10, 0.03, 0.91

Question 16

For a sample of n = 16 individuals,how large a Pearson correlation is necessary to be statistically significant for a two-tailed test with α = .05?​

Accepted Answer

A) 0.497​ 
B) ​0.482 
C) ​0.468 
D) ​0.456 
A) 0.497​ 
B) ​0.482 
C) ​0.468 
D) ​0.456

Question 17

What correlation is obtained when the Pearson correlation is computed for data that have been converted to ranks?​

Accepted Answer

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

Question 18

A sample of n = 25 pairs of scores (X and Y values)produces a correlation of r = -0.40.Are these sample data sufficient to conclude that there is a significant non-zero correlation between X and Y in the population? Use a two-tailed test at the .05 level of significance.

Accepted Answer

H₀: ρ = 0.For the given data,df

Question 19

The value obtained for the sum of products,SP,determines the sign (+/)for the correlation.

Accepted Answer

A) True 
 B)False

Question 20

What is indicated by a positive value for a correlation?​

Accepted Answer

A) ​Increases in X tend to be accompanied by increases in Y. 
B) ​Increases in X tend to be accompanied by decreases in Y. 
C) ​A much stronger relationship exists than if the correlation were negative. 
D) ​A much weaker relationship exists than if the correlation were negative. 
A) ​Increases in X tend to be accompanied by increases in Y. 
B) ​Increases in X tend to be accompanied by decreases in Y. 
C) ​A much stronger relationship exists than if the correlation were negative. 
D) ​A much weaker relationship exists than if the correlation were negative.

If the data points in a scatter plot show a nearly circular pattern,then the correlation is near zero.

As the sample size gets larger,what happens to the size of the correlation that is needed for significance?

A researcher measures IQ and weight for a group of college students.What kind of correlation is likely to be obtained for these two variables?

If you measured hearing acuity and age for a group of people who are 50 to 90 years old,you should obtain a negative correlation between the two variables.

The phi-coefficient is used to measure relationships for data that would also be appropriate for an independent-measures t test.

There is a statistical technique,known as partial correlation,which allows a researcher to measure the relationship between two variables while eliminating or holding constant the influence of a third variable.

A researcher records the odometer reading and age of used Hondas.What kind of correlation is likely to be obtained for these two variables?

For a group of graduating college seniors,a researcher records each student's rank in his/her high school graduating class and the student's rank in the college graduating class.Which correlation should be used to measure the relationship between these two variables?

A set of n = 10 pairs of scores has ΣX = 20,ΣY = 30,and ΣXY = 74.What is the value of SP for these data?

If the Pearson correlation for a set of scores is equal to +1.00,then the Spearman correlation for the same scores would also be equal to +1.00.

Whenever a correlation is computed from scores that do not represent the full range of possible values,one is working with a restricted range and caution should be used when interpreting the correlation.

A set of n = 15 pairs of scores (X and Y values)produces a correlation of r = 0.40.If each of the X values is multiplied by 2 and the correlation is computed for the new scores,what value will be obtained for the new correlation?

Using a two-tailed test with α = .05,a sample correlation of r = 0.355 for a sample of n = 30 individuals is large enough to conclude that there is a real correlation in the general population.

A set of n = 5 pairs of X and Y values has SS_X = 16,SS_Y = 4 and SP = 2.For these data,the Pearson correlation is ____.

Which of the following sets of correlations is correctly ordered from the highest to the lowest degree of relationship?

For a sample of n = 16 individuals,how large a Pearson correlation is necessary to be statistically significant for a two-tailed test with α = .05?

What correlation is obtained when the Pearson correlation is computed for data that have been converted to ranks?

A sample of n = 25 pairs of scores (X and Y values)produces a correlation of r = -0.40.Are these sample data sufficient to conclude that there is a significant non-zero correlation between X and Y in the population? Use a two-tailed test at the .05 level of significance.

The value obtained for the sum of products,SP,determines the sign (+/)for the correlation.

What is indicated by a positive value for a correlation?

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

If the data points in a scatter plot show a nearly circular pattern,then the correlation is near zero.

As the sample size gets larger,what happens to the size of the correlation that is needed for significance?​

A researcher measures IQ and weight for a group of college students.What kind of correlation is likely to be obtained for these two variables?​

If you measured hearing acuity and age for a group of people who are 50 to 90 years old,you should obtain a negative correlation between the two variables.

The phi-coefficient is used to measure relationships for data that would also be appropriate for an independent-measures t test.

There is a statistical technique,known as partial correlation,which allows a researcher to measure the relationship between two variables while eliminating or holding constant the influence of a third variable.

A researcher records the odometer reading and age of used Hondas.What kind of correlation is likely to be obtained for these two variables?​

For a group of graduating college seniors,a researcher records each student's rank in his/her high school graduating class and the student's rank in the college graduating class.Which correlation should be used to measure the relationship between these two variables?​

A set of n = 10 pairs of scores has ΣX = 20,ΣY = 30,and ΣXY = 74.What is the value of SP for these data?​

If the Pearson correlation for a set of scores is equal to +1.00,then the Spearman correlation for the same scores would also be equal to +1.00.

Whenever a correlation is computed from scores that do not represent the full range of possible values,one is working with a restricted range and caution should be used when interpreting the correlation.

A set of n = 15 pairs of scores (X and Y values)produces a correlation of r = 0.40.If each of the X values is multiplied by 2 and the correlation is computed for the new scores,what value will be obtained for the new correlation?​

Using a two-tailed test with α = .05,a sample correlation of r = 0.355 for a sample of n = 30 individuals is large enough to conclude that there is a real correlation in the general population.​

A set of n = 5 pairs of X and Y values has SSX = 16,SSY = 4 and SP = 2.For these data,the Pearson correlation is ____.​

​Which of the following sets of correlations is correctly ordered from the highest to the lowest degree of relationship?

For a sample of n = 16 individuals,how large a Pearson correlation is necessary to be statistically significant for a two-tailed test with α = .05?​

What correlation is obtained when the Pearson correlation is computed for data that have been converted to ranks?​

A sample of n = 25 pairs of scores (X and Y values)produces a correlation of r = -0.40.Are these sample data sufficient to conclude that there is a significant non-zero correlation between X and Y in the population? Use a two-tailed test at the .05 level of significance.

The value obtained for the sum of products,SP,determines the sign (+/)for the correlation.

What is indicated by a positive value for a correlation?​

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

As the sample size gets larger,what happens to the size of the correlation that is needed for significance?

A researcher measures IQ and weight for a group of college students.What kind of correlation is likely to be obtained for these two variables?

A researcher records the odometer reading and age of used Hondas.What kind of correlation is likely to be obtained for these two variables?

For a group of graduating college seniors,a researcher records each student's rank in his/her high school graduating class and the student's rank in the college graduating class.Which correlation should be used to measure the relationship between these two variables?

A set of n = 10 pairs of scores has ΣX = 20,ΣY = 30,and ΣXY = 74.What is the value of SP for these data?

A set of n = 15 pairs of scores (X and Y values)produces a correlation of r = 0.40.If each of the X values is multiplied by 2 and the correlation is computed for the new scores,what value will be obtained for the new correlation?

Using a two-tailed test with α = .05,a sample correlation of r = 0.355 for a sample of n = 30 individuals is large enough to conclude that there is a real correlation in the general population.

A set of n = 5 pairs of X and Y values has SS_X = 16,SS_Y = 4 and SP = 2.For these data,the Pearson correlation is ____.

Which of the following sets of correlations is correctly ordered from the highest to the lowest degree of relationship?

For a sample of n = 16 individuals,how large a Pearson correlation is necessary to be statistically significant for a two-tailed test with α = .05?

What correlation is obtained when the Pearson correlation is computed for data that have been converted to ranks?

What is indicated by a positive value for a correlation?