Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

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 3

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

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 4

Suppose that there is a correlation of r = 0.41 between the amount of time that each student reports studying for an exam and the student's grade on the exam.This correlation would mean that there is a tendency for people who study more to get better grades.

Accepted Answer

A) True 
 B)False

Question 5

A researcher records the odometer reading and price for a group 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 6

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 7

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) It is still called a Pearson correlation. 
A) the Spearman correlation. 
B) the point-biserial correlation. 
C) the phi coefficient. 
D) It is still called a Pearson correlation.

Question 8

A researcher measures driving distance from college and weekly cost of gas for a group of commuting 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 9

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 10

Suppose 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%

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

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

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

Suppose that there is a correlation of r = 0.41 between the amount of time that each student reports studying for an exam and the student's grade on the exam.This correlation would mean that there is a tendency for people who study more to get better grades.

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

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?

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

A researcher measures driving distance from college and weekly cost of gas for a group of commuting college students.What kind of correlation is likely to be obtained for these two variables?

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

Suppose 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?

Introduction to Statistics

Frequency Distributions

Central Tendency

Variability

Z-Scores

Probability

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 Anova

Two-Factor Analysis of Variance

Introduction to Regression

Chi-Square Tests

The Binomial Test

Choosing the Right Statistics

Filters

Exam 15: Correlation

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

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

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\alpha=.05α=.05 ?

Suppose that there is a correlation of r = 0.41 between the amount of time that each student reports studying for an exam and the student's grade on the exam.This correlation would mean that there is a tendency for people who study more to get better grades.

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

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?

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

A researcher measures driving distance from college and weekly cost of gas for a group of commuting college students.What kind of correlation is likely to be obtained for these two variables?

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

Suppose 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?

Introduction to Statistics

Frequency Distributions

Central Tendency

Variability

Z-Scores

Probability

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 Anova

Two-Factor Analysis of Variance

Introduction to Regression

Chi-Square Tests

The Binomial Test

Choosing the Right Statistics

Filters

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