Question 1

In the equation Y = bX + a , X and Y , a is _________.

Accepted Answer

A)  a constant giving the value of the Y axis intercept 
B)  a constant giving the value of the slope of the line 
C)  a variable relating X to Y 
D)  a variable relating Y to X 
A)  a constant giving the value of the Y axis intercept 
B)  a constant giving the value of the slope of the line 
C)  a variable relating X to Y 
D)  a variable relating Y to X

Question 2

For the following X and Y scores, how much of the variability of Y is accounted for by knowledge of X ? Assume a linear relationship.

Accepted Answer

A)  68% 
B)  34% 
C)  58% 
D)  27% 
A)  68% 
B)  34% 
C)  58% 
D)  27%

Question 3

Rho is used _________.

Accepted Answer

A)  when both variables are dichotomous 
B)  when both variables are of interval or ratio scaling 
C)  when one or both variables are only of ordinal scaling 
D)  when the data is nonlinear 
A)  when both variables are dichotomous 
B)  when both variables are of interval or ratio scaling 
C)  when one or both variables are only of ordinal scaling 
D)  when the data is nonlinear

Question 4

In an inverse relationship as one variable gets larger the other variable gets smaller.

Accepted Answer

A) True 
 B)False

Question 5

If one calculates r for raw scores, and then calculates r on the z scores of the same data, the value of r will _______.

Accepted Answer

A)  stay the same 
B)  decrease 
C)  increase 
D)  equal 1.00 
A)  stay the same 
B)  decrease 
C)  increase 
D)  equal 1.00

Question 6

r decreases as N decreases.

Accepted Answer

A) True 
 B)False

Question 7

What is the value of r for the following relationship between height and weight?

Accepted Answer

A)  0.87 
B)  0.76 
C)  0.93 
D)  0.56 
A)  0.87 
B)  0.76 
C)  0.93 
D)  0.56

Question 8

When deciding which measure of correlation to employ with a specific set of data, you should consider _________.

Accepted Answer

A)  whether the relationship is linear or nonlinear 
B)  type of scale of measurement for each variable 
C)  a and b 
D)  none of these 
A)  whether the relationship is linear or nonlinear 
B)  type of scale of measurement for each variable 
C)  a and b 
D)  none of these

Question 9

If a relationship is linear, _________.

Accepted Answer

A)  the relation can be most accurately represented by a straight line 
B)  all the points fall on a curved line 
C)  the relationship is best represented by a curved line 
D)  all the points must fall on a straight line 
A)  the relation can be most accurately represented by a straight line 
B)  all the points fall on a curved line 
C)  the relationship is best represented by a curved line 
D)  all the points must fall on a straight line

Question 10

If r = - 1.00, the relationship is imperfect.

Accepted Answer

A) True 
 B)False

Question 11

If the standard deviation of one of the variables equals zero, r cannot be calculated.

Accepted Answer

A) True 
 B)False

Question 12

In a perfect linear relationship all the points must fall on a straight line.

Accepted Answer

A) True 
 B)False

Question 13

If a correlation is perfect,

Accepted Answer

A)  all the points must fall on a straight line 
B)  all the points must fall on a curve line 
C)  most the points must fall on the line, but some can miss it. 
D)  all the points must fall on a straight or curved line, 
A)  all the points must fall on a straight line 
B)  all the points must fall on a curve line 
C)  most the points must fall on the line, but some can miss it. 
D)  all the points must fall on a straight or curved line,

Question 14

The lowest degree of correlation shown below is _________.

Accepted Answer

A)  0.75 
B)  - 0.33 
C)  - 0.25 
D)  0.15 
A)  0.75 
B)  - 0.33 
C)  - 0.25 
D)  0.15

Question 15

If the correlation between variables X and Y is 0.95, which of the following is true?

Accepted Answer

A)  X is a cause of Y 
B)  Y is a cause of X 
C)  low scores on X are accompanied by high scores on Y 
D)  high scores on X are accompanied by high scores on Y 
E)  a and d 
A)  X is a cause of Y 
B)  Y is a cause of X 
C)  low scores on X are accompanied by high scores on Y 
D)  high scores on X are accompanied by high scores on Y 
E)  a and d

Question 16

As the value of r increases, the proportion of variability of Y that is accounted for by X decreases.

Accepted Answer

A) True 
 B)False

Question 17

In order for the correlation coefficient to be negative, which of the following must be true?

Accepted Answer

A)  ΣXY > ( ΣX )( Σ Y )/ N 
B)  ΣXY (ΣX )( ΣY )/ N 
C)  ΣXY = ( ΣX )( ΣY )/ N 
D)  ΣXY must be zero 
A)  ΣXY > ( ΣX )( Σ Y )/ N 
B)  ΣXY (ΣX )( ΣY )/ N 
C)  ΣXY = ( ΣX )( ΣY )/ N 
D)  ΣXY must be zero

Question 18

In a positive relationship, _________.

Accepted Answer

A)  b is negative 
B)  b is positive 
C)  a must be positive 
D)  a must be negative 
A)  b is negative 
B)  b is positive 
C)  a must be positive 
D)  a must be negative

Question 19

In a linear relationship all the points must fall on a straight line.

Accepted Answer

A) True 
 B)False

Question 20

A scatter plot is used to help determine if the relationship is linear or curvilinear.

Accepted Answer

A) True 
 B)False

In the equation Y = bX + a , X and Y , a is _________.

For the following X and Y scores, how much of the variability of Y is accounted for by knowledge of X ? Assume a linear relationship.

Rho is used _________.

In an inverse relationship as one variable gets larger the other variable gets smaller.

If one calculates r for raw scores, and then calculates r on the z scores of the same data, the value of r will _______.

r decreases as N decreases.

What is the value of r for the following relationship between height and weight?

When deciding which measure of correlation to employ with a specific set of data, you should consider _________.

If a relationship is linear, _________.

If r = - 1.00, the relationship is imperfect.

If the standard deviation of one of the variables equals zero, r cannot be calculated.

In a perfect linear relationship all the points must fall on a straight line.

If a correlation is perfect,

The lowest degree of correlation shown below is _________.

If the correlation between variables X and Y is 0.95, which of the following is true?

As the value of r increases, the proportion of variability of Y that is accounted for by X decreases.

In order for the correlation coefficient to be negative, which of the following must be true?

In a positive relationship, _________.

In a linear relationship all the points must fall on a straight line.

A scatter plot is used to help determine if the relationship is linear or curvilinear.

Statistics and Scientific Method

Basic Mathematical and Measurement Concepts

Frequency Distributions

Measures of Central Tendency and Variability

The Normal Curve and Standard Scores

Linear Regression

Random Sampling and Probability

Binomial Distribution

Introduction to Hypothesis Testing: Using the Sign Test

Power

Sampling Distributions, Sampling Distribution of the Mean: the Normal Deviate Z Test

Students T Test for Single Samples

Students T Test for Correlated and Independent Groups

Introduction to the Analysis of Variance

Introduction to the Two-Way Analysis of Variance

Chi-Square and Other Nonparametric Tests

Filters

Exam 6: Correlation

In the equation Y = bX + a , X and Y , a is _________.

For the following X and Y scores, how much of the variability of Y is accounted for by knowledge of X ? Assume a linear relationship.

Rho is used _________.

In an inverse relationship as one variable gets larger the other variable gets smaller.

If one calculates r for raw scores, and then calculates r on the z scores of the same data, the value of r will _______.

r decreases as N decreases.

What is the value of r for the following relationship between height and weight?

When deciding which measure of correlation to employ with a specific set of data, you should consider _________.

If a relationship is linear, _________.

If r = - 1.00, the relationship is imperfect.

If the standard deviation of one of the variables equals zero, r cannot be calculated.

In a perfect linear relationship all the points must fall on a straight line.

If a correlation is perfect,

The lowest degree of correlation shown below is _________.

If the correlation between variables X and Y is 0.95, which of the following is true?

As the value of r increases, the proportion of variability of Y that is accounted for by X decreases.

In order for the correlation coefficient to be negative, which of the following must be true?

In a positive relationship, _________.

In a linear relationship all the points must fall on a straight line.

A scatter plot is used to help determine if the relationship is linear or curvilinear.

Statistics and Scientific Method

Basic Mathematical and Measurement Concepts

Frequency Distributions

Measures of Central Tendency and Variability

The Normal Curve and Standard Scores

Linear Regression

Random Sampling and Probability

Binomial Distribution

Introduction to Hypothesis Testing: Using the Sign Test

Power

Sampling Distributions, Sampling Distribution of the Mean: the Normal Deviate Z Test

Students T Test for Single Samples

Students T Test for Correlated and Independent Groups

Introduction to the Analysis of Variance

Introduction to the Two-Way Analysis of Variance

Chi-Square and Other Nonparametric Tests

Filters