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

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You cannot make any clear sens...

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

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

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0.22 or 22%

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

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


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

E) A) and C)
F) A) and D)

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C

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

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Predictor variable: ...

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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?


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.

E) A) and D)
F) B) and C)

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B

A U-shaped pattern is an example of a


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

E) None of the above
F) A) and B)

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The values of rho are


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

E) B) and D)
F) None of the above

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A linear regression procedure should ultimately yield a value called


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

E) All of the above
F) A) and B)

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


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

E) B) and C)
F) A) and D)

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What type of relationship does the following regression line represent? What type of relationship does the following regression line represent?

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A positive...

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What kind of relationship is depicted in the following graph? What kind of relationship is depicted in the following graph?

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A negative...

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


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

E) B) and D)
F) All of the above

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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?

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First, square .65, which is .4...

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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?

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


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.

E) B) and C)
F) B) and D)

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

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Predictor variable: ...

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


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

E) A) and C)
F) A) and B)

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


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

E) A) and B)
F) B) and D)

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