Question 1

Which pair of variables below reflect a strong linear correlation, but the correlation is probably explained at least partially by one or more confounding variables?

Accepted Answer

A)   education level and per capita income
B)   number of siblings and mother's education level
C)   soft drink consumption and drowning rates
D)   all of the aboveE) None of the above
F) B) and C) D

Question 2

A correlation of .70 between two variables suggests that about percent of the variations in one variable is related to the variations in the other one.

Accepted Answer

A)   1
B)   70
C)   49
D)   100E) A) and B)
F) A) and C)

Question 3

If, in the previous question, the correlation had been -1.0, what would happen after the students are asked to line up by weight?

Accepted Answer

A)   About half of the students will move; others will stay in place.
B)   Only the 13th student will stay in place; everyone else will move to the same position but in the opposite end of the line.
C)   Everyone will have to move, but in no discernible pattern.
D)   No one will have to move.E) None of the above
F) B) and C) B

Question 4

Which pair of variables below are probably correlated, but the correlation is not a linear one?

Accepted Answer

A)   age and earned income for ages 16 to 90.
B)   automobile weight and gasoline mileage
C)   earned income and monthly house payment
D)   alcohol consumption and severity of marital problemsE) All of the above
F) B) and C)

Question 5

If two variables reflect a perfect (1.0 or -1.0)  correlation,

Accepted Answer

A)   the body of the graph of the correlation will contain a straight line.
B)   there will be no exception to the overall pattern of the relationship between variables.
C)   the two "variables" are probably just two different indicators of the same variable.
D)   all of the aboveE) A) and B)
F) C) and D)

Question 6

A form of statistical analysis that uses correlation to form homogeneous groups of cases based upon there responses to several different questions is:

Accepted Answer

A)   factor analysis
B)   cluster analysis
C)   Multiple R
D)   factor rotationE) B) and C)
F) A) and D)

Question 7

Two variables reflected a strong, statistically significant negative correlation within a research sample. How should this be interpreted?

Accepted Answer

A)   The values of one variable cannot have caused the values of the other variable.
B)   The values of the predictor variable caused the values of the outcome variable.
C)   The values of the outcome variable caused the values of the predictor variables.
D)   The values of the predictor value may have caused the values of the outcome variable.E) A) and B)
F) A) and C)

Question 8

A statistical test that can examine the relationship between two interval or ratio level variables while controlling for the influence of a third, potentially confounding one is

Accepted Answer

A)   partial r.
B)   Pearson's r.
C)   factor analysis.
D)   Kendall's tau.E) None of the above
F) A) and C)

Question 9

If one or both variables are interval or ratio level but skewed, a correlation coefficient can still be produced by computing:

Accepted Answer

A)   partial r.
B)   Kendall's tau or Spearman's rho
C)   Pearson's r
D)   Multiple RE) C) and D)
F) B) and C)

Question 10

A form of statistical analysis that uses correlation to identify redundancy in a newly constructed data collection instrument so that it can be eliminated or equivalent forms of the instrument can be developed is:

Accepted Answer

A)   factor analysis
B)   cluster analysis
C)   Multiple R
D)   factor rotationE) A) and B)
F) A) and C) A

Question 11

Correlation between variables can be displayed graphically using a:

Accepted Answer

A)   frequency polygon.
B)   stem and leaf plot
C)   scattergram.
D)   pie chart.E) None of the above
F) All of the above

Question 12

A table that displays the bivariate correlations between several different pairs of variables is called a:

Accepted Answer

A)   scattergram.
B)   correlation matrix.
C)   step-down graph
D)   beta weightE) All of the above
F) A) and B)

Question 13

Correlation analyses are used for:

Accepted Answer

A)   construction of data collection instruments such as scales.
B)   describing the strength and direction of a relationship between variables.
C)   determining if a relationship between variables is statistically significant.
D)   all of the aboveE) A) and B)
F) A) and C)

Question 14

In a social work class, there is a perfect positive correlation (1.0)  between height and weight. All 25 students are asked to line up by height, shortest to tallest. What will happen if they are then asked to line up by weight, lightest to heaviest?

Accepted Answer

A)   About half of the students will move; others will stay in place.
B)   Only the 13th student will stay in place; everyone else will move to the same position but in the opposite end of the line.
C)   Everyone will have to move, but in no discernible pattern.
D)   No one will have to move.E) All of the above
F) A) and C)

Question 15

Which correlation coefficient below suggests the strongest relationship between two variables?

Accepted Answer

A)   .65
B)   .05
C)   -.72
D)   .50E) All of the above
F) C) and D)

Exam 9: Correlation Analyses

Which pair of variables below reflect a strong linear correlation, but the correlation is probably explained at least partially by one or more confounding variables?

Correct Answer
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D

A correlation of .70 between two variables suggests that about percent of the variations in one variable is related to the variations in the other one.

Correct Answer
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If, in the previous question, the correlation had been -1.0, what would happen after the students are asked to line up by weight?

Correct Answer
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B

Which pair of variables below are probably correlated, but the correlation is not a linear one?

Correct Answer
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If two variables reflect a perfect (1.0 or -1.0) correlation,

Correct Answer
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A form of statistical analysis that uses correlation to form homogeneous groups of cases based upon there responses to several different questions is:

Correct Answer
verified

Two variables reflected a strong, statistically significant negative correlation within a research sample. How should this be interpreted?

Correct Answer
verified

A statistical test that can examine the relationship between two interval or ratio level variables while controlling for the influence of a third, potentially confounding one is

Correct Answer
verified

If one or both variables are interval or ratio level but skewed, a correlation coefficient can still be produced by computing:

Correct Answer
verified

A form of statistical analysis that uses correlation to identify redundancy in a newly constructed data collection instrument so that it can be eliminated or equivalent forms of the instrument can be developed is:

Correct Answer
verified
A

Correlation between variables can be displayed graphically using a:

Correct Answer
verified

A table that displays the bivariate correlations between several different pairs of variables is called a:

Correct Answer
verified

Correlation analyses are used for:

Correct Answer
verified

In a social work class, there is a perfect positive correlation (1.0) between height and weight. All 25 students are asked to line up by height, shortest to tallest. What will happen if they are then asked to line up by weight, lightest to heaviest?

Correct Answer
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Which correlation coefficient below suggests the strongest relationship between two variables?

Correct Answer
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Exam 9: Correlation Analyses

Which pair of variables below reflect a strong linear correlation, but the correlation is probably explained at least partially by one or more confounding variables?

Correct AnswerverifiedD

A correlation of .70 between two variables suggests that about percent of the variations in one variable is related to the variations in the other one.

Correct AnswerverifiedShow Answer

If, in the previous question, the correlation had been -1.0, what would happen after the students are asked to line up by weight?

Correct AnswerverifiedB

Which pair of variables below are probably correlated, but the correlation is not a linear one?

Correct AnswerverifiedShow Answer

If two variables reflect a perfect (1.0 or -1.0) correlation,

Correct AnswerverifiedShow Answer

A form of statistical analysis that uses correlation to form homogeneous groups of cases based upon there responses to several different questions is:

Correct AnswerverifiedShow Answer

Two variables reflected a strong, statistically significant negative correlation within a research sample. How should this be interpreted?

Correct AnswerverifiedShow Answer

A statistical test that can examine the relationship between two interval or ratio level variables while controlling for the influence of a third, potentially confounding one is

Correct AnswerverifiedShow Answer

If one or both variables are interval or ratio level but skewed, a correlation coefficient can still be produced by computing:

Correct AnswerverifiedShow Answer

A form of statistical analysis that uses correlation to identify redundancy in a newly constructed data collection instrument so that it can be eliminated or equivalent forms of the instrument can be developed is:

Correct AnswerverifiedA

Correlation between variables can be displayed graphically using a:

Correct AnswerverifiedShow Answer

A table that displays the bivariate correlations between several different pairs of variables is called a:

Correct AnswerverifiedShow Answer

Correlation analyses are used for:

Correct AnswerverifiedShow Answer

In a social work class, there is a perfect positive correlation (1.0) between height and weight. All 25 students are asked to line up by height, shortest to tallest. What will happen if they are then asked to line up by weight, lightest to heaviest?

Correct AnswerverifiedShow Answer

Which correlation coefficient below suggests the strongest relationship between two variables?

Correct AnswerverifiedShow Answer

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D

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B

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A

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