An experimenter computing the correlation between age and memory span would
a. be able to show that old age produces a decrease in memory span.
b. be able to determine that a third variable was involved.
c. make an error because age and memory span are measured on different scales.
d. be able to determine whether there is a relationship between age and memory span.
A factorial design has two levels of factor A and three levels of factor B with six participants in each condition. The F-ratio for the interaction of A x B would have _____ degrees of freedom.
a. 2, 35
b. 2, 30
c. 6, 35
d. 6, 30
In an experiment, a confounding variable is a(n) ____.
a. example of the third-variable problem
b. example of the directionality problem
c. limitation on the ability to manipulate the independent variable
d. threat to internal validity
The spread of the averages around the average of averages in a sampling distribution is called the ____.
a. standard deviation
b. variance
c. standard error
d. sampling error
The correlation coefficient does not indicate
a. the association between two variables.
b. the direction of the relationship between two variables.
c. the effect of one variable on another.
d. how one factor varies with another.
A factorial design has two levels of factor A and three levels of factor B with six participants in each condition. The F-ratio for factor B would have _____ degrees of freedom.
a. 1, 35
b. 1, 30
c. 2, 35
d. 2, 30
Which characteristic is necessary for an extraneous variable to become a confounding variable?
a. It must change systematically from one participant to the next.
b. It must change systematically when the independent variable is changed.
c. It must have no systematic relationship with the dependent variable.
d. It must have no systematic relationship to the independent or dependent variables.
The theoretical distribution of an infinite number of samples of the population of interest in a study is called a(n) ____ distribution.
a. probabilistic
b. sampling
c. likelihood
d. error
Low correlations
a. imply that the two variables are causally related.
b. are found only with Pearson coefficients.
c. may be produced by a restricted range of one of the variables.
d. are seldom observed in psychological research.
A factorial design has two levels of factor A and three levels of factor B with six participants in each condition. The F-ratio for factor A would have _____ degrees of freedom.
a. 1, 35
b. 1, 30
c. 2, 35
d. 2, 30
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