Question 1

The closer that data points fall to the regression line,the more closely two factors are related.

Accepted Answer

A) True 
 B)False

Question 2

An unanticipated variable not accounted for in a research study that could be causing or associated with observed changes in one or more measured variables is called

Accepted Answer

A) reverse causality 
B) restriction of range 
C) a confound variable 
D) homoscedasticity 
A) reverse causality 
B) restriction of range 
C) a confound variable 
D) homoscedasticity

Question 3

Suppose a correlation is computed in each of two samples.If the value of   is the same in each sample,and   is larger in Sample 1,then in which sample will the value of the correlation coefficient be larger?

Accepted Answer

A) Sample 1 
B) Sample 2 
C) None;the correlation coefficient will be the same in both samples. 
D) There is not enough information to answer this question. 
A) Sample 1 
B) Sample 2 
C) None;the correlation coefficient will be the same in both samples. 
D) There is not enough information to answer this question.

Question 4

Which of the following would not be reported for a correlation?

Accepted Answer

A) the sample size 
B) the coefficient of determination 
C) the critical values for each test 
D) the strength and direction of the correlation 
A) the sample size 
B) the coefficient of determination 
C) the critical values for each test 
D) the strength and direction of the correlation

Question 5

The denominator of the correlation coefficient measures the extent to which two variables

Accepted Answer

A) vary together 
B) vary independently 
C) covary 
D) both A and C 
A) vary together 
B) vary independently 
C) covary 
D) both A and C

Question 6

The appropriate correlation coefficient for measuring for the direction and strength of the linear relationship between two dichotomous variables is

Accepted Answer

A) the Spearman rank-order correlation coefficient 
B) the point-biserial correlation coefficient 
C) the phi correlation coefficient 
D) none of the above 
A) the Spearman rank-order correlation coefficient 
B) the point-biserial correlation coefficient 
C) the phi correlation coefficient 
D) none of the above

Question 7

Outliers can change the _____ of a correlation.

Accepted Answer

A) direction 
B) strength 
C) sign (+,-) 
D) all of the above 
A) direction 
B) strength 
C) sign (+,-) 
D) all of the above

Question 8

The formula for the point-biserial correlation coefficient was derived from the formula for the Pearson correlation coefficient.

Accepted Answer

A) True 
 B)False

Question 9

The correlation coefficient ranges from -1.0 to +1.0,with values closer to ±1.0 indicating

Accepted Answer

A) a more positive relationship between two factors 
B) a stronger relationship between two factors 
C) that two factors are less likely to be related 
D) that the correlation is due to outliers 
A) a more positive relationship between two factors 
B) a stronger relationship between two factors 
C) that two factors are less likely to be related 
D) that the correlation is due to outliers

Question 10

The coefficient of determination is a measure of significance.

Accepted Answer

A) True 
 B)False

Question 11

A researcher computes the following phi correlation coefficient:   = 0.42.If the sample size was 20,then what is the decision for this correlation test?

Accepted Answer

A) Retain the null hypothesis. 
B) Reject the null hypothesis. 
C) There is not enough information to answer this question. 
A) Retain the null hypothesis. 
B) Reject the null hypothesis. 
C) There is not enough information to answer this question.

Question 12

Which of the following is the assumption that the best way to describe the pattern of data is using a straight line?

Accepted Answer

A) normality 
B) linearity 
C) homoscedasticity 
D) restriction of range 
A) normality 
B) linearity 
C) homoscedasticity 
D) restriction of range

Question 13

A researcher measures the following correlation between cost of produce and number of units sold.Which description best explains the relationship between these two factors?

Accepted Answer

A) As the cost of produce increases,so also do the number of units sold. 
B) Less expensive produce is associated with an increased number of units sold. 
C) Less expensive produce is associated with a decreased number of units sold. 
D) No linear pattern is evident. 
A) As the cost of produce increases,so also do the number of units sold. 
B) Less expensive produce is associated with an increased number of units sold. 
C) Less expensive produce is associated with a decreased number of units sold. 
D) No linear pattern is evident.

Question 14

A researcher observes a correlation of values from 2 to 10 points and draws conclusions about the full range of values in the population from 0 to 21 points.Which limitation for correctly interpreting a correlation coefficient did the researcher violate?

Accepted Answer

A) reverse causality 
B) restriction of range 
C) a confound variable 
D) homoscedasticity 
A) reverse causality 
B) restriction of range 
C) a confound variable 
D) homoscedasticity

Question 15

Which of the following is the assumption that there is an equal variance of data points dispersed along the regression line?

Accepted Answer

A) normality 
B) linearity 
C) homoscedasticity 
D) restriction of range 
A) normality 
B) linearity 
C) homoscedasticity 
D) restriction of range

Question 16

We convert r to a chi-square statistic for which of the following correlation tests?

Accepted Answer

A) Pearson 
B) Spearman 
C) point-biserial 
D) phi 
A) Pearson 
B) Spearman 
C) point-biserial 
D) phi

Question 17

The phi correlation coefficient is used to measure the correlation between two ordinal variables.

Accepted Answer

A) True 
 B)False

Question 18

A positive correlation is always stronger than a negative correlation.

Accepted Answer

A) True 
 B)False

Question 19

A researcher determines that   = 3.76 to test for significance for a phi correlation coefficient.What was the decision for this phi correlation test?

Accepted Answer

A) Retain the null hypothesis. 
B) Reject the null hypothesis 
C) There is not enough information to answer this question. 
A) Retain the null hypothesis. 
B) Reject the null hypothesis 
C) There is not enough information to answer this question.

Question 20

When we compute many correlations in a single study,we report each correlation coefficient in a table called a correlation matrix.

Accepted Answer

A) True 
 B)False

The closer that data points fall to the regression line,the more closely two factors are related.

An unanticipated variable not accounted for in a research study that could be causing or associated with observed changes in one or more measured variables is called

Suppose a correlation is computed in each of two samples.If the value of is the same in each sample,and is larger in Sample 1,then in which sample will the value of the correlation coefficient be larger?

Which of the following would not be reported for a correlation?

The denominator of the correlation coefficient measures the extent to which two variables

The appropriate correlation coefficient for measuring for the direction and strength of the linear relationship between two dichotomous variables is

Outliers can change the _____ of a correlation.

The formula for the point-biserial correlation coefficient was derived from the formula for the Pearson correlation coefficient.

The correlation coefficient ranges from -1.0 to +1.0,with values closer to ±1.0 indicating

The coefficient of determination is a measure of significance.

A researcher computes the following phi correlation coefficient: = 0.42.If the sample size was 20,then what is the decision for this correlation test?

Which of the following is the assumption that the best way to describe the pattern of data is using a straight line?

A researcher measures the following correlation between cost of produce and number of units sold.Which description best explains the relationship between these two factors?

A researcher observes a correlation of values from 2 to 10 points and draws conclusions about the full range of values in the population from 0 to 21 points.Which limitation for correctly interpreting a correlation coefficient did the researcher violate?

Which of the following is the assumption that there is an equal variance of data points dispersed along the regression line?

We convert r to a chi-square statistic for which of the following correlation tests?

The phi correlation coefficient is used to measure the correlation between two ordinal variables.

A positive correlation is always stronger than a negative correlation.

A researcher determines that = 3.76 to test for significance for a phi correlation coefficient.What was the decision for this phi correlation test?

When we compute many correlations in a single study,we report each correlation coefficient in a table called a correlation matrix.

Introduction to Statistics

Summarizing Data: Frequency Distributions in

Summarizing Data: Central Tendency

Summarizing Data: Variability

Probability, Normal Distributions, and Z Scores

Characteristics of the Sample Mean

Hypothesis Testing: Significance, Effect Size, and Power

Testing Means: One-Sample T Test With Confidence Intervals

Testing Means: Two- Independent-Sample T Test With Confidence Intervals

Testing Means: Related-Samples T Test With Confidence Intervals

One-Way Analysis of Variance: Between- Subjects and Within- Subjects Repeated- Measures Designs

Two-Way Analysis of Variance: Between-Subjects Factorial Design

Correlation and Linear Regression

Chi-Square Tests: Goodness of Fit and the Test for Independence

Nonparametric Tests for Ordinal Data: Understanding and Interpretation

Chi-Square Tests: Goodness-of-Fit and Independence

Understanding Regression Analysis

Filters

Exam 18: Understanding Correlation Coefficients in Statistical Analysis

The closer that data points fall to the regression line,the more closely two factors are related.

An unanticipated variable not accounted for in a research study that could be causing or associated with observed changes in one or more measured variables is called

Suppose a correlation is computed in each of two samples.If the value of is the same in each sample,and is larger in Sample 1,then in which sample will the value of the correlation coefficient be larger?

Which of the following would not be reported for a correlation?

The denominator of the correlation coefficient measures the extent to which two variables

The appropriate correlation coefficient for measuring for the direction and strength of the linear relationship between two dichotomous variables is

Outliers can change the _____ of a correlation.

The formula for the point-biserial correlation coefficient was derived from the formula for the Pearson correlation coefficient.

The correlation coefficient ranges from -1.0 to +1.0,with values closer to ±1.0 indicating

The coefficient of determination is a measure of significance.

A researcher computes the following phi correlation coefficient: = 0.42.If the sample size was 20,then what is the decision for this correlation test?

Which of the following is the assumption that the best way to describe the pattern of data is using a straight line?

A researcher measures the following correlation between cost of produce and number of units sold.Which description best explains the relationship between these two factors?

A researcher observes a correlation of values from 2 to 10 points and draws conclusions about the full range of values in the population from 0 to 21 points.Which limitation for correctly interpreting a correlation coefficient did the researcher violate?

Which of the following is the assumption that there is an equal variance of data points dispersed along the regression line?

We convert r to a chi-square statistic for which of the following correlation tests?

The phi correlation coefficient is used to measure the correlation between two ordinal variables.

A positive correlation is always stronger than a negative correlation.

A researcher determines that = 3.76 to test for significance for a phi correlation coefficient.What was the decision for this phi correlation test?

When we compute many correlations in a single study,we report each correlation coefficient in a table called a correlation matrix.

Introduction to Statistics

Summarizing Data: Frequency Distributions in

Summarizing Data: Central Tendency

Summarizing Data: Variability

Probability, Normal Distributions, and Z Scores

Characteristics of the Sample Mean

Hypothesis Testing: Significance, Effect Size, and Power

Testing Means: One-Sample T Test With Confidence Intervals

Testing Means: Two- Independent-Sample T Test With Confidence Intervals

Testing Means: Related-Samples T Test With Confidence Intervals

One-Way Analysis of Variance: Between- Subjects and Within- Subjects Repeated- Measures Designs

Two-Way Analysis of Variance: Between-Subjects Factorial Design

Correlation and Linear Regression

Chi-Square Tests: Goodness of Fit and the Test for Independence

Nonparametric Tests for Ordinal Data: Understanding and Interpretation

Chi-Square Tests: Goodness-of-Fit and Independence

Understanding Regression Analysis

Filters