Question 1

Researchers who study the process of reading in children have discovered that better readers make smoother eye movements across the page (i.e., there is a positive correlation between reading skill and the smoothness of the eye movements) .Which statement is a possible cause of the correlation between smooth eye movements and reading ability?

Accepted Answer

A)   The ability to make smooth eye movements improves reading ability.
B)   Having good reading skills allows a child to make smooth eye movements.
C)   Some third factor might cause both smooth eye movements and improved reading ability.
D)   All of these options are possible causes of the correlation.

Question 2

What is the best way to test a measure's internal consistency?

Accepted Answer

A)   test-retest
B)   random sampling
C)   criterion-related
D)   split-half

Question 3

Researchers who study the process of reading in children have discovered that better readers watch fewer hours of television.If a scatterplot of the data is drawn, the points on the graph would likely run from _____ left to _____ right.

Accepted Answer

A)   upper; lower
B)   lower; upper
C)   upper; upper
D)   lower; lower

Question 4

When performing a hypothesis test for correlation, one tests the null hypothesis that $\rho  $ = 1.0.

Accepted Answer

A) True 
 B)False

Question 5

What kind of correlation would one expect to find between the results of two dice thrown simultaneously?

Accepted Answer

A)   positive
B)   zero
C)   negative
D)   perfect positive

Question 6

When performing a hypothesis test for correlation, one tests the null hypothesis that $\rho  $ = 0.0.

Accepted Answer

A) True 
 B)False

Question 7

If two variables are negatively correlated, they cannot be causally related.

Accepted Answer

A) True 
 B)False

Question 8

The correlation of height and weight is 0.75, and the correlation of depression and satisfaction with work is -0.42.Which is a stronger correlation and why?

Accepted Answer

A)   height and weight; 0.75 is closer to 1 than -0.42 is to -1
B)   depression and work satisfaction; 0.75 is closer to 1 than -0.42 is to -1
C)   height and weight; -0.42 is closer to -1 than 0.75 is to 1
D)   depression and work satisfaction; -0.42 is closer to -1 than 0.75 is to 1

Question 9

As the age of a male professor increases, the hair on his head decreases.This is an example of what type of correlation?

Accepted Answer

A)   positive
B)   negative
C)   zero
D)   perfect

Question 10

In calculating the correlation coefficient, the denominator corrects for variability and sample size.

Accepted Answer

A) True 
 B)False

Question 11

Researchers who study the process of reading in children have discovered that better readers make smoother eye movements across the page.If a scatterplot of the data is drawn, the points on the graph would likely run from _____ left to _____ right.

Accepted Answer

A)   upper; lower
B)   lower; upper
C)   upper; upper
D)   lower; lower

Question 12

The first step in calculating a correlation is to examine the data using a visual display.

Accepted Answer

A) True 
 B)False

Question 13

A researcher is interested in days spent unemployed and feelings of efficacy related to work.She wonders what impact one's explanatory style might have on the relationship between these variables.She wants to be sure to understand the relation between her variables as clearly as possible.What technique could she use to help address this issue, and what would be accomplished through this method?

Accepted Answer

A)   Analysis of variance will allow her to examine the influence of all variables at once.
B)   Regression will allow all three variables to be examined simultaneously.
C)   Partial correlation will allow her to examine the relationship between length of unemployment and efficacy while removing the influence of the third variable, explanatory style.
D)   Correlations performed between each pair of variables will allow her to examine which relationship is the strongest.

Question 14

A positive correlation between head size and foot size indicates that:

Accepted Answer

A)   having a large head causes a person to have large feet.
B)   having large feet causes a person to have a large head.
C)   people with larger feet also tend to have larger heads.
D)   people with larger feet tend to have smaller heads.

Question 15

Use the following to answer questions 
The relation between a hockey player's age and the number of minutes he spent in the penalty box during the regular 2006-2007 season is shown in the figure.The 18 players were members of the New Jersey Devils hockey team who played in more than 40 games that season.
Figure: Age and Penalty Minutes 
-(Figure: Age and Penalty Minutes)  Based on the scatterplot, what is the relation between a hockey player's age and the number of minutes he spent in the penalty box?

Accepted Answer

A)   perfect positive
B)   positive
C)   negative
D)   no relation

Question 16

What is the formula for the Pearson correlation coefficient?

Accepted Answer

A)    ∑[(X−MX) (Y−MY) ](SSX) (SSY) \frac { \sum \left[ \left( X - M _ { X } \right)  \left( Y - M _ { Y } \right)  \right] } { \sqrt { \left( S S _ { X } \right)  \left( S S _ { Y } \right)  } }(SSX​) (SSY​) c-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5,-10,-9.5,-14c0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54c44.2,-33.3,65.8,-50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10s173,378,173,378c0.7,0,35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429c69,-144,104.5,-217.7,106.5,-221l0 -0c5.3,-9.3,12,-14,20,-14H400000v40H845.2724s-225.272,467,-225.272,467s-235,486,-235,486c-2.7,4.7,-9,7,-19,7c-6,0,-10,-1,-12,-3s-194,-422,-194,-422s-65,47,-65,47zM834 80h400000v40h-400000z'/>​∑[(X−MX​) (Y−MY​) ]​ 
B)    ∑[(X−MX) (Y−MY) ](SDX) (SDY) \frac { \sum \left[ \left( X - M _ { X } \right)  \left( Y - M _ { Y } \right)  \right] } { \sqrt { \left( S D _ { X } \right)  \left( S D _ { Y } \right)  } }(SDX​) (SDY​) c-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5,-10,-9.5,-14c0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54c44.2,-33.3,65.8,-50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10s173,378,173,378c0.7,0,35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429c69,-144,104.5,-217.7,106.5,-221l0 -0c5.3,-9.3,12,-14,20,-14H400000v40H845.2724s-225.272,467,-225.272,467s-235,486,-235,486c-2.7,4.7,-9,7,-19,7c-6,0,-10,-1,-12,-3s-194,-422,-194,-422s-65,47,-65,47zM834 80h400000v40h-400000z'/>​∑[(X−MX​) (Y−MY​) ]​ 
C)    ∑[(X−MX) (Y−MY) ](SSX) (SSY) \frac { \sum \left[ \left( X - M _ { X } \right)  \left( Y - M _ { Y } \right)  \right] } { \left( S S _ { X } \right)  \left( S S _ { Y } \right)  }(SSX​) (SSY​) ∑[(X−MX​) (Y−MY​) ]​ 
D)    ∑[(X−MX) (Y−MY) ]\sum \left[ \left( X - M _ { X } \right)  \left( Y - M _ { Y } \right)  \right]∑[(X−MX​) (Y−MY​) ]

Question 17

If one wishes to assess the relation between race and access to healthcare, it may be important to take into account the overlapping variability that race and access to healthcare share with household income.If a correlation between race and access to healthcare is found after controlling for household income, it indicates that:

Accepted Answer

A)   access to healthcare is not associated with race or household income.
B)   race, access to healthcare, and household income are perfectly correlated with one another.
C)   there are racial inequities in access to healthcare that cannot be accounted for by differences in household income.
D)   any differences in access to healthcare are attributable to differences in household income.

Question 18

Psychometrics is a field that is saturated with qualified professionals.

Accepted Answer

A) True 
 B)False

Question 19

If a negative relation exists between two variables, then low scores on one variable will be associated with _____ scores on the other variable.

Accepted Answer

A)   low
B)   high
C)   both high and low
D)   neither high nor low

Exam 15: Correlation

The first step in calculating a correlation is to examine the data using a visual display.

Correct Answer
verified

The correlation of height and weight is 0.75, and the correlation of depression and satisfaction with work is -0.42.Which is a stronger correlation and why?

Correct Answer
verified

Psychometrics is a field that is saturated with qualified professionals.

Correct Answer
verified

In calculating the correlation coefficient, the denominator corrects for variability and sample size.

Correct Answer
verified

Correct Answer
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A positive correlation between head size and foot size indicates that:

Correct Answer
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Correct Answer
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As the age of a male professor increases, the hair on his head decreases.This is an example of what type of correlation?

Correct Answer
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Correct Answer
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If two variables are negatively correlated, they cannot be causally related.

Correct Answer
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Correct Answer
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What is the formula for the Pearson correlation coefficient?

Correct Answer
verified

What is the best way to test a measure's internal consistency?

Correct Answer
verified

What kind of correlation would one expect to find between the results of two dice thrown simultaneously?

Correct Answer
verified

When performing a hypothesis test for correlation, one tests the null hypothesis that $\rho$ = 1.0.

Correct Answer
verified

If a negative relation exists between two variables, then low scores on one variable will be associated with _____ scores on the other variable.

Correct Answer
verified

When performing a hypothesis test for correlation, one tests the null hypothesis that $\rho$ = 0.0.

Correct Answer
verified

Researchers who study the process of reading in children have discovered that better readers watch fewer hours of television.If a scatterplot of the data is drawn, the points on the graph would likely run from _ left to _ right.

Correct Answer
verified

Researchers who study the process of reading in children have discovered that better readers make smoother eye movements across the page.If a scatterplot of the data is drawn, the points on the graph would likely run from _ left to _ right.

Correct Answer
verified

Exam 15: Correlation

The first step in calculating a correlation is to examine the data using a visual display.

Correct AnswerverifiedShow Answer

The correlation of height and weight is 0.75, and the correlation of depression and satisfaction with work is -0.42.Which is a stronger correlation and why?

Correct AnswerverifiedShow Answer

Psychometrics is a field that is saturated with qualified professionals.

Correct AnswerverifiedShow Answer

In calculating the correlation coefficient, the denominator corrects for variability and sample size.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A positive correlation between head size and foot size indicates that:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

As the age of a male professor increases, the hair on his head decreases.This is an example of what type of correlation?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

If two variables are negatively correlated, they cannot be causally related.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is the formula for the Pearson correlation coefficient?

Correct AnswerverifiedShow Answer

What is the best way to test a measure's internal consistency?

Correct AnswerverifiedShow Answer

What kind of correlation would one expect to find between the results of two dice thrown simultaneously?

Correct AnswerverifiedShow Answer

When performing a hypothesis test for correlation, one tests the null hypothesis that ρ\rho ρ = 1.0.

Correct AnswerverifiedShow Answer

If a negative relation exists between two variables, then low scores on one variable will be associated with _____ scores on the other variable.

Correct AnswerverifiedShow Answer

When performing a hypothesis test for correlation, one tests the null hypothesis that ρ\rho ρ = 0.0.

Correct AnswerverifiedShow Answer

Researchers who study the process of reading in children have discovered that better readers watch fewer hours of television.If a scatterplot of the data is drawn, the points on the graph would likely run from _____ left to _____ right.

Correct AnswerverifiedShow Answer

Researchers who study the process of reading in children have discovered that better readers make smoother eye movements across the page.If a scatterplot of the data is drawn, the points on the graph would likely run from _____ left to _____ right.

Correct AnswerverifiedShow Answer

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When performing a hypothesis test for correlation, one tests the null hypothesis that $\rho$ = 1.0.

Correct Answer
verified

Correct Answer
verified

When performing a hypothesis test for correlation, one tests the null hypothesis that $\rho$ = 0.0.

Correct Answer
verified

Researchers who study the process of reading in children have discovered that better readers watch fewer hours of television.If a scatterplot of the data is drawn, the points on the graph would likely run from _ left to _ right.

Correct Answer
verified

Researchers who study the process of reading in children have discovered that better readers make smoother eye movements across the page.If a scatterplot of the data is drawn, the points on the graph would likely run from _ left to _ right.

Correct Answer
verified