Question 1

If the correlation coefficient for X and Y is calculated to be +.47, what is the proportion of variance accounted for?

Accepted Answer

0.22 or 22%

Question 2

Dr.Johnston has calculated a correlation between the number of cigarettes smoked per week and the age of his patients at the point of their first heart attack as r = -0.92.Dr.Johnston and his associates claim there apparently is no relationship between smoking and heart attacks.What error has Dr.Johnson made?

Accepted Answer

A) No error has been made; an r = -0.92 is so close to 0 that there is no relationship. 
B) A correlation coefficient this close to -1 means there probably is a relationship, but we probably should do a significance test just to be sure. 
C) Not everyone who smokes has a heart attack. 
D) Dr.Johnston should know there are numerous factors involved when a person has a heart attack. 
A) No error has been made; an r = -0.92 is so close to 0 that there is no relationship. 
B) A correlation coefficient this close to -1 means there probably is a relationship, but we probably should do a significance test just to be sure. 
C) Not everyone who smokes has a heart attack. 
D) Dr.Johnston should know there are numerous factors involved when a person has a heart attack. B

Question 3

Which of the following r-values indicates the weakest relationship between two variables?

Accepted Answer

A) +0.45 
B) -0.30 
C) +0.03 
D) -0.45 
A) +0.45 
B) -0.30 
C) +0.03 
D) -0.45 C

Question 4

What type of relationship does the following regression line represent?

Accepted Answer

A positive

Question 5

If the correlation coefficient for X and Y is calculated to be -.95, what is the proportion of variance accounted for?

Accepted Answer

The answer of If the correlation coefficient for X and...

Question 6

Suppose you find that sleepiness and happiness are correlated at -.65.What does this value tell us in terms of what percentage of happiness is not associated with sleepiness?

Accepted Answer

First, square .65, which is .4

Question 7

Which of the following r-values indicates the strongest relationship between two variables?

Accepted Answer

A) +0.65 
B) -0.89 
C) +0.10 
D) -0.10 
A) +0.65 
B) -0.89 
C) +0.10 
D) -0.10

Question 8

If the proportion of variance accounted for is 36%, what is the correlation coefficient for X and Y?

Accepted Answer

The answer of If the proportion of variance accounted for...

Question 9

Suppose a researcher is trying to figure out how one's anxiety may predict depression scores.What are the criterion and predictor variables?

Accepted Answer

Predictor variable:

Question 10

Dr.Phillips has conducted a correlational study with 112 subjects.However, she only has X and Y values for 107 of these subjects.What are the degrees of freedom in this study?

Accepted Answer

The answer of Dr.Phillips has conducted a correlational study with...

Question 11

"The more you save, the less you spend" describes

Accepted Answer

A) a positive linear correlation. 
B) a negative linear correlation. 
C) no correlation. 
D) a nonlinear correlation. 
A) a positive linear correlation. 
B) a negative linear correlation. 
C) no correlation. 
D) a nonlinear correlation.

Question 12

The values of rho are

Accepted Answer

A) between -1 and +1. 
B) unrestricted. 
C) between 0 and +1. 
D) any positive number. 
A) between -1 and +1. 
B) unrestricted. 
C) between 0 and +1. 
D) any positive number.

Question 13

In a linear relationship, as the X scores increase, the Y scores change

Accepted Answer

A) in only one direction. 
B) only in the negative direction. 
C) only in the positive direction. 
D) in the positive and then in the negative direction. 
A) in only one direction. 
B) only in the negative direction. 
C) only in the positive direction. 
D) in the positive and then in the negative direction.

Question 14

Suppose you are trying to predict how a child's IQ is impacted by their mother's IQ.State the criterion and predictor variables.

Accepted Answer

Predictor variable:

Question 15

A U-shaped pattern is an example of a

Accepted Answer

A) curvilinear relationship. 
B) non-relationship. 
C) positive relationship. 
D) negative relationship. 
A) curvilinear relationship. 
B) non-relationship. 
C) positive relationship. 
D) negative relationship.

Question 16

What kind of relationship is depicted in the following graph?

Accepted Answer

A negative

Question 17

Suppose income and personal health are correlated at .35.What can you say about cause and effect?

Accepted Answer

You cannot make any clear sens

Question 18

A linear regression procedure should ultimately yield a value called

Accepted Answer

A) Y prime. 
B) rho. 
C) the slope. 
D) the proportion of variance accounted for. 
A) Y prime. 
B) rho. 
C) the slope. 
D) the proportion of variance accounted for.

Question 19

In general, a positive correlation means as the values of one variable  ________, there is a tendency for the values of the other variable to  ________.

Accepted Answer

A) increase; increase 
B) increase; decrease 
C) decrease; increase 
D) decrease; decrease 
A) increase; increase 
B) increase; decrease 
C) decrease; increase 
D) decrease; decrease

Question 20

"The bigger they are, the harder they fall" describes

Accepted Answer

A) a positive linear correlation. 
B) a negative linear correlation. 
C) no correlation. 
D) a nonlinear correlation. 
A) a positive linear correlation. 
B) a negative linear correlation. 
C) no correlation. 
D) a nonlinear correlation.

If the correlation coefficient for X and Y is calculated to be +.47, what is the proportion of variance accounted for?

Which of the following r-values indicates the weakest relationship between two variables?

What type of relationship does the following regression line represent?

If the correlation coefficient for X and Y is calculated to be -.95, what is the proportion of variance accounted for?

Suppose you find that sleepiness and happiness are correlated at -.65.What does this value tell us in terms of what percentage of happiness is not associated with sleepiness?

Which of the following r-values indicates the strongest relationship between two variables?

If the proportion of variance accounted for is 36%, what is the correlation coefficient for X and Y?

Suppose a researcher is trying to figure out how one's anxiety may predict depression scores.What are the criterion and predictor variables?

Dr.Phillips has conducted a correlational study with 112 subjects.However, she only has X and Y values for 107 of these subjects.What are the degrees of freedom in this study?

"The more you save, the less you spend" describes

The values of rho are

In a linear relationship, as the X scores increase, the Y scores change

Suppose you are trying to predict how a child's IQ is impacted by their mother's IQ.State the criterion and predictor variables.

A U-shaped pattern is an example of a

What kind of relationship is depicted in the following graph?

Suppose income and personal health are correlated at .35.What can you say about cause and effect?

A linear regression procedure should ultimately yield a value called

In general, a positive correlation means as the values of one variable , there is a tendency for the values of the other variable to .

"The bigger they are, the harder they fall" describes

Introduction to Statistics and Research

Creating and Using Frequency Distributions

Summarizing Scores With Measures of Central Tendency

Summarizing Scores With Measures of Variability

Describing Data With Z-Scores and the Normal Curve

Using Probability to Make Decisions About Data

Overview of Statistical Hypothesis Testing: the Z-Test

Hypothesis Testing Using the One-Sample T-Test

Hypothesis Testing Using the Two-Sample T-Test

Hypothesis Testing Using the One-Way Analysis of Variance

Understanding the Two-Way Analysis of Variance

Chi Square and Nonparametric Procedures

Filters

Exam 10: Describing Relationships Using Correlation and Regression

If the correlation coefficient for X and Y is calculated to be +.47, what is the proportion of variance accounted for?

Which of the following r-values indicates the weakest relationship between two variables?

What type of relationship does the following regression line represent?

If the correlation coefficient for X and Y is calculated to be -.95, what is the proportion of variance accounted for?

Suppose you find that sleepiness and happiness are correlated at -.65.What does this value tell us in terms of what percentage of happiness is not associated with sleepiness?

Which of the following r-values indicates the strongest relationship between two variables?

If the proportion of variance accounted for is 36%, what is the correlation coefficient for X and Y?

Suppose a researcher is trying to figure out how one's anxiety may predict depression scores.What are the criterion and predictor variables?

Dr.Phillips has conducted a correlational study with 112 subjects.However, she only has X and Y values for 107 of these subjects.What are the degrees of freedom in this study?

"The more you save, the less you spend" describes

The values of rho are

In a linear relationship, as the X scores increase, the Y scores change

Suppose you are trying to predict how a child's IQ is impacted by their mother's IQ.State the criterion and predictor variables.

A U-shaped pattern is an example of a

What kind of relationship is depicted in the following graph?

Suppose income and personal health are correlated at .35.What can you say about cause and effect?

A linear regression procedure should ultimately yield a value called

In general, a positive correlation means as the values of one variable ________, there is a tendency for the values of the other variable to ________.

"The bigger they are, the harder they fall" describes

Introduction to Statistics and Research

Creating and Using Frequency Distributions

Summarizing Scores With Measures of Central Tendency

Summarizing Scores With Measures of Variability

Describing Data With Z-Scores and the Normal Curve

Using Probability to Make Decisions About Data

Overview of Statistical Hypothesis Testing: the Z-Test

Hypothesis Testing Using the One-Sample T-Test

Hypothesis Testing Using the Two-Sample T-Test

Hypothesis Testing Using the One-Way Analysis of Variance

Understanding the Two-Way Analysis of Variance

Chi Square and Nonparametric Procedures

Filters

In general, a positive correlation means as the values of one variable , there is a tendency for the values of the other variable to .