Question 1

What does a correlation coefficient do?

Accepted Answer

A) It allows us to draw conclusions about whether one variable causes another variable. 
B) It creates a correlational design, rather than an experimental design. 
C) It simplifies a complex pattern involving many scores into one easily interpreted statistic. 
D) It summarizes the X scores and the Y scores separately. 
A) It allows us to draw conclusions about whether one variable causes another variable. 
B) It creates a correlational design, rather than an experimental design. 
C) It simplifies a complex pattern involving many scores into one easily interpreted statistic. 
D) It summarizes the X scores and the Y scores separately.

Question 2

Use the following data set and conduct a one-tailed test of significance in the upper tail on the Pearson r.Use $\alpha$ =
.05. 
a.What are your null and alternative hypotheses?
b.What are your degrees of freedom?
c.What is the critical value?
d.Calculate the Pearson r
e.What do you conclude?

Accepted Answer

a. @#LAT-DLM& b.df = 9 - 2 = 7
c. @#LAT-DLM& = 0.5

Question 3

What kind of relationship is depicted in the following graph?

Accepted Answer

None

Question 4

What kind of relationship is depicted in the following graph?

Accepted Answer

A positive

Question 5

If you have a Pearson correlation coefficient of .30, what is the proportion of variance accounted for?

Accepted Answer

A) .09 
B) .90 
C) .60 
D) .30 
A) .09 
B) .90 
C) .60 
D) .30

Question 6

Use the following data set and conduct a two-tailed test of significance on the Pearson r.Use $\alpha$ = .05. 
a.What are your null and alternative hypotheses?
b.What are your degrees of freedom?
c.What is the critical value?
d.Calculate the Pearson r
e.What do you conclude? $\begin{array}{|l|l|}
\hline {\text { Study A }} \
\hline X & Y \
\hline 2 & 8 \
\hline 5 & 4 \
\hline 8 & 2 \
\hline 4 & 5 \
\hline 5 & 4 \
\hline 6 & 5 \
\hline 1 & 9 \
\hline 6 & 5 \
\hline 3 & 6 \
\hline
\end{array}$

Accepted Answer

a. @#LAT-DLM& b.df = 9 - 2 = 7 c. @#LAT-DLM& = 0.

Question 7

Suppose you've done a study and you're writing up your results for presentation in an APA journal.You want to report a significant correlation of -.72 with degrees of freedom of 51.How would you report this?

Accepted Answer

The answer of Suppose you've done a study and you're...

Question 8

The best-fitting line through a scatterplot is known as the

Accepted Answer

A) linear scatterplot line. 
B) linear correlation line. 
C) linear variance line. 
D) linear regression line. 
A) linear scatterplot line. 
B) linear correlation line. 
C) linear variance line. 
D) linear regression line.

Question 9

What kind of relationship is depicted in the following graph?

Accepted Answer

A nonlinea

Question 10

We should do a scatterplot of the data when we compute a correlation because the scatterplot allows us to

Accepted Answer

A) see the particular relationship and map out the best way to summarize it. 
B) determine the exact value of the correlation coefficient. 
C) determine whether a relationship is likely to exist in the population from which the sample is taken. 
D) predict accurate Y scores for known X scores. 
A) see the particular relationship and map out the best way to summarize it. 
B) determine the exact value of the correlation coefficient. 
C) determine whether a relationship is likely to exist in the population from which the sample is taken. 
D) predict accurate Y scores for known X scores.

Question 11

In general, a zero correlation means

Accepted Answer

A) as the values of one variable increase, there is no tendency for the values of the other variable to change in any consistent, predictable fashion. 
B) as the values of one variable increase, there is a tendency for the values of the other variable also to increase. 
C) as the values of one variable increase, there is a tendency for the values of the other variable to decrease. 
D) as the values of one variable decrease, there is a tendency for the values of the other variable also to decrease. 
A) as the values of one variable increase, there is no tendency for the values of the other variable to change in any consistent, predictable fashion. 
B) as the values of one variable increase, there is a tendency for the values of the other variable also to increase. 
C) as the values of one variable increase, there is a tendency for the values of the other variable to decrease. 
D) as the values of one variable decrease, there is a tendency for the values of the other variable also to decrease.

Question 12

What are the consequences of having a restricted range?

Accepted Answer

A) Obtaining a smaller r than otherwise would be the case. 
B) Obtaining a larger r than otherwise would be the case. 
C) Having a curvilinear instead of a linear relationship. 
D) Having a correlation with a different direction than otherwise would be found. 
A) Obtaining a smaller r than otherwise would be the case. 
B) Obtaining a larger r than otherwise would be the case. 
C) Having a curvilinear instead of a linear relationship. 
D) Having a correlation with a different direction than otherwise would be found.

Question 13

What type of relationship does the following regression line represent?

Accepted Answer

A negative

Question 14

When plotting correlational data, the appropriate graph to use is the

Accepted Answer

A) line graph. 
B) bar graph. 
C) histogram. 
D) scatterplot. 
A) line graph. 
B) bar graph. 
C) histogram. 
D) scatterplot.

Question 15

Use the following data set and conduct a two-tailed test of significance on the Pearson r.Use $\alpha$ = .05. 
a.What are your null and alternative hypotheses?
b.What are your degrees of freedom?
c.What is the critical value?
d.Calculate the Pearson r
e.What do you conclude?

Accepted Answer

a. @#LAT-DLM& b.df = 9 - 2 = 7
c. @#LAT-DLM& = 0.6

Question 16

Professor Miller has found the correlation between a person's "need for affiliation" found by taking a test to determine the need to be with others) and the number of hours spent watching television is −0.69.He should conclude

Accepted Answer

A) as we observe people with higher and higher need for affiliation, we see a tendency for those people to spend less and less time watching television. 
B) there is not much of a relationship between the two variables because the r is negative. 
C) as we observe people with higher and higher need for affiliation, we see a tendency for those people to spend more and more time watching television. 
D) the people who watch more television tend to have more need to be around others. 
A) as we observe people with higher and higher need for affiliation, we see a tendency for those people to spend less and less time watching television. 
B) there is not much of a relationship between the two variables because the r is negative. 
C) as we observe people with higher and higher need for affiliation, we see a tendency for those people to spend more and more time watching television. 
D) the people who watch more television tend to have more need to be around others.

Question 17

Which relationship is stronger, r = +0.62 or r = -0.62?

Accepted Answer

A) An r = +0.62 represents a stronger relationship than r = -0.62. 
B) An r = -0.62 represents a stronger relationship than r = +0.62. 
C) There is no difference in the strength of the two relationships. 
D) Without seeing a scatterplot of the data, there is no way to determine which is stronger. 
A) An r = +0.62 represents a stronger relationship than r = -0.62. 
B) An r = -0.62 represents a stronger relationship than r = +0.62. 
C) There is no difference in the strength of the two relationships. 
D) Without seeing a scatterplot of the data, there is no way to determine which is stronger.

Question 18

What type of relationship does the following regression line represent?

Accepted Answer

The answer of What type of relationship does the following...

Question 19

Suppose you've calculated a Pearson correlation coefficient and had a final value of +10.How do you interpret this result?

Accepted Answer

You have made an err

Question 20

When the correlation coefficient representing the relationship between X and Y is intermediate, then all of the following are true except

Accepted Answer

A) there is not a perfectly consistent association. 
B) there are different Y scores associated with a single X score. 
C) prediction of Y from a known X score has some error. 
D) all data points fall on the regression line. 
A) there is not a perfectly consistent association. 
B) there are different Y scores associated with a single X score. 
C) prediction of Y from a known X score has some error. 
D) all data points fall on the regression line.

What does a correlation coefficient do?

What kind of relationship is depicted in the following graph?

What kind of relationship is depicted in the following graph?

If you have a Pearson correlation coefficient of .30, what is the proportion of variance accounted for?

Suppose you've done a study and you're writing up your results for presentation in an APA journal.You want to report a significant correlation of -.72 with degrees of freedom of 51.How would you report this?

The best-fitting line through a scatterplot is known as the

What kind of relationship is depicted in the following graph?

We should do a scatterplot of the data when we compute a correlation because the scatterplot allows us to

In general, a zero correlation means

What are the consequences of having a restricted range?

What type of relationship does the following regression line represent?

When plotting correlational data, the appropriate graph to use is the

Professor Miller has found the correlation between a person's "need for affiliation" found by taking a test to determine the need to be with others) and the number of hours spent watching television is −0.69.He should conclude

Which relationship is stronger, r = +0.62 or r = -0.62?

What type of relationship does the following regression line represent?

Suppose you've calculated a Pearson correlation coefficient and had a final value of +10.How do you interpret this result?

When the correlation coefficient representing the relationship between X and Y is intermediate, then all of the following are true except

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

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Exam 10: Describing Relationships Using Correlation and Regression

What does a correlation coefficient do?

Use the following data set and conduct a one-tailed test of significance in the upper tail on the Pearson r.Use α\alphaα = .05. a.What are your null and alternative hypotheses? b.What are your degrees of freedom? c.What is the critical value? d.Calculate the Pearson r e.What do you conclude?

What kind of relationship is depicted in the following graph?

What kind of relationship is depicted in the following graph?

If you have a Pearson correlation coefficient of .30, what is the proportion of variance accounted for?

Suppose you've done a study and you're writing up your results for presentation in an APA journal.You want to report a significant correlation of -.72 with degrees of freedom of 51.How would you report this?

The best-fitting line through a scatterplot is known as the

What kind of relationship is depicted in the following graph?

We should do a scatterplot of the data when we compute a correlation because the scatterplot allows us to

In general, a zero correlation means

What are the consequences of having a restricted range?

What type of relationship does the following regression line represent?

When plotting correlational data, the appropriate graph to use is the

Use the following data set and conduct a two-tailed test of significance on the Pearson r.Use α\alphaα = .05. a.What are your null and alternative hypotheses? b.What are your degrees of freedom? c.What is the critical value? d.Calculate the Pearson r e.What do you conclude?

Professor Miller has found the correlation between a person's "need for affiliation" found by taking a test to determine the need to be with others) and the number of hours spent watching television is −0.69.He should conclude

Which relationship is stronger, r = +0.62 or r = -0.62?

What type of relationship does the following regression line represent?

Suppose you've calculated a Pearson correlation coefficient and had a final value of +10.How do you interpret this result?

When the correlation coefficient representing the relationship between X and Y is intermediate, then all of the following are true except

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