Question 1

A set of X and Y scores has a Pearson correlation of r = -0.60.For these data,60% of the variability in the Y scores can be predicted from the relationship with X.

Accepted Answer

A) True 
 B)False

Question 2

A researcher finds a significant correlation between the amount of time spent watching television and blood pressure for a sample of 40-year-old men.This means that watching more television causes high blood pressure.

Accepted Answer

A) True 
 B)False

Question 3

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 4

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 5

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 than if the correlation were negative 
D) A much weaker relationship 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 than if the correlation were negative 
D) A much weaker relationship than if the correlation were negative

Question 6

The regression equation is determined by finding the minimum value for which of the following?

Accepted Answer

A) ?(X - Y)2 
B) ?(Y - ?) 
C) ?(Y - ?)2 
D) r²?(Y - ?)2 
A) ?(X - Y)2 
B) ?(Y - ?) 
C) ?(Y - ?)2 
D) r²?(Y - ?)2

Question 7

For the regression equation Y = X - 2,if the mean for Y is MY = 6,what is the mean for X?

Accepted Answer

A) 4 
B) 6 
C) 8 
D) 10 
A) 4 
B) 6 
C) 8 
D) 10

Question 8

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 9

A researcher obtains a Pearson correlation of r = 0.60 for a sample of n = 6 pairs of X and Y scores.If the researcher tests the significance of the correlation,what value will be obtained for the t statistic?

Accepted Answer

A) 0.6/0.16 = 3.75 
B) 0.6/0.4 = 1.50 
C) 0/6/0.8 = 0.77 
D) 0.6/1.0 = 0.6 
A) 0.6/0.16 = 3.75 
B) 0.6/0.4 = 1.50 
C) 0/6/0.8 = 0.77 
D) 0.6/1.0 = 0.6

Question 10

For the regression equation,Ŷ = -2X + 6,if the X value is above the mean (positive deviation),what can be determined about the predicted Y value?

Accepted Answer

A) The predicted Y value will be above the mean for the Y scores. 
B) The predicted Y value will be below the mean for the Y scores. 
C) The predicted Y value will be equal to the mean for the Y scores. 
D) It is impossible to determine where the predicted Y value will be. 
A) The predicted Y value will be above the mean for the Y scores. 
B) The predicted Y value will be below the mean for the Y scores. 
C) The predicted Y value will be equal to the mean for the Y scores. 
D) It is impossible to determine where the predicted Y value will be.

Question 11

The Pearson correlation is calculated for a sample of n = 20 individuals.If a hypothesis test is used to determine whether the correlation is significant,what df value would be used for the t statistic?

Accepted Answer

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

Question 12

The line defined by the equation Y = -3X + 6 slopes up to the right.

Accepted Answer

A) True 
 B)False

Question 13

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

Accepted Answer

A) -1 
B) -5 	4 
C) 5 	1 
D) None of the other 3 choices is correct. 
A) -1 
B) -5 	4 
C) 5 	1 
D) None of the other 3 choices is correct.

Question 14

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

Accepted Answer

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

Question 15

A linear regression equation has b = 3 and a = - 6.What is the predicted value of Y for X = 4?

Accepted Answer

A) Ŷ = 6 
B) Ŷ = -21 
C) Ŷ = -2 
D) Cannot be determined without additional information 
A) Ŷ = 6 
B) Ŷ = -21 
C) Ŷ = -2 
D) Cannot be determined without additional information

Question 16

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 17

A researcher records the age 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 18

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 19

The effect size for the data from an independent-measures t test can be measured by r²,which is the percentage of variance accounted for.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) None of the other options will produce r². 
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) None of the other options will produce r².

Question 20

One or two extreme data points can have a dramatic effect on the size of a correlation.

Accepted Answer

A) True 
 B)False

A set of X and Y scores has a Pearson correlation of r = -0.60.For these data,60% of the variability in the Y scores can be predicted from the relationship with X.

A researcher finds a significant correlation between the amount of time spent watching television and blood pressure for a sample of 40-year-old men.This means that watching more television causes high blood pressure.

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?

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

What is indicated by a positive value for a correlation?

The regression equation is determined by finding the minimum value for which of the following?

For the regression equation Y = X - 2,if the mean for Y is MY = 6,what is the mean for X?

Under what circumstances is the phi-coefficient used?

A researcher obtains a Pearson correlation of r = 0.60 for a sample of n = 6 pairs of X and Y scores.If the researcher tests the significance of the correlation,what value will be obtained for the t statistic?

For the regression equation,Ŷ = -2X + 6,if the X value is above the mean (positive deviation),what can be determined about the predicted Y value?

The Pearson correlation is calculated for a sample of n = 20 individuals.If a hypothesis test is used to determine whether the correlation is significant,what df value would be used for the t statistic?

The line defined by the equation Y = -3X + 6 slopes up to the right.

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

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

A linear regression equation has b = 3 and a = - 6.What is the predicted value of Y for X = 4?

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

A researcher records the age and price for a group of used Hondas.What kind of correlation is likely to be obtained for 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?

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

One or two extreme data points can have a dramatic effect on the size of 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 and Two-Factor Analysis of Variance

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

Filters

Exam 14: Correlation and Regression.

A set of X and Y scores has a Pearson correlation of r = -0.60.For these data,60% of the variability in the Y scores can be predicted from the relationship with X.

A researcher finds a significant correlation between the amount of time spent watching television and blood pressure for a sample of 40-year-old men.This means that watching more television causes high blood pressure.

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?

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

What is indicated by a positive value for a correlation?

The regression equation is determined by finding the minimum value for which of the following?

For the regression equation Y = X - 2,if the mean for Y is MY = 6,what is the mean for X?

Under what circumstances is the phi-coefficient used?

A researcher obtains a Pearson correlation of r = 0.60 for a sample of n = 6 pairs of X and Y scores.If the researcher tests the significance of the correlation,what value will be obtained for the t statistic?

For the regression equation,Ŷ = -2X + 6,if the X value is above the mean (positive deviation),what can be determined about the predicted Y value?

The Pearson correlation is calculated for a sample of n = 20 individuals.If a hypothesis test is used to determine whether the correlation is significant,what df value would be used for the t statistic?

The line defined by the equation Y = -3X + 6 slopes up to the right.

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

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

A linear regression equation has b = 3 and a = - 6.What is the predicted value of Y for X = 4?

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

A researcher records the age and price for a group of used Hondas.What kind of correlation is likely to be obtained for 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?

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

One or two extreme data points can have a dramatic effect on the size of 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 and Two-Factor Analysis of Variance

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

Filters