When deciding which measure of correlation to employ with a specific set of data, you should consider _________.
a. whether the relationship is linear or nonlinear
b. type of scale of measurement for each variable
c. both of these
d. none of these
Knowing nothing more than that IQ and memory scores are correlated 0.84, you could validly conclude that _________.
a. good memory causes high IQ
b. high IQ causes good memory
c. neither good memory nor high IQ cause each other
d. a third variable causes both good memory and high IQ
e. none of these
If the correlation between variables X and Y is 0.95, which of the following is true?
a. X is a cause of Y
b. Y is a cause of X
c. low scores on X are accompanied by high scores on Y
d. high scores on X are accompanied by high scores on Y
e. X is a cause of Y and high scores on X are accompanied by high scores on Y
Which of the following is(are) correct interpretation(s) of correlation? Correlation _________.
a. indicates the degree of the relationship between two variables
b. indicates a causal relationship between two variables
c. is useful in deciding which variables to manipulate in an experimental study
d. a and b
e. a and c
The closer the points on a scatter diagram fall to the regression line, the _________ between the scores.
a. higher the correlation c. correlation doesn't change
b. lower the correlation d. need more information
A relationship can be _________.
a. perfect c. nonexistant
b. imperfect d. all of these
In an imperfect relationship, _________.
a. all the points fall on the line
b. a relationship exists, but all of the points do not fall on the line
c. no relationship exists
d. a relationship exists, but none of the points can fall on the line
In a perfect relationship, _________.
a. all the points fall on the line
b. none of the points fall on the line
c. some of the points fall on the line
d. the points form an ellipse around the line
In a negative relationship, _________.
a. b is positive c. a must be negative
b. b can be either positive or negative d. b is negative
In a positive relationship, _________.
a. b is negative c. a must be positive
b. b is positive d. a must be negative
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