Which of the following is an example of a negative correlation?
a. Body weight increases as children get older.
b. The rate of heart attacks is directly proportional to yearly income.
c. Shoe size increases as height increases.
d. The likelihood of owning a baseball card collection decreases with age.
In a study examining the effects of time of day (morning or afternoon) and temperature (cool, normal, warm) on worker productivity, the factorial notation would be
a. 2 x 2
b. 2 x 5
c. 1 x 6
d. 2 x 3
In order to establish an unambiguous relationship between two variables, it is necessary to eliminate the possible influence of ____ variables.
a. extraneous
b. confounding
c. independent
d. dependent
A sample that starts with subjects known to the experimenter, and is enlarged by adding subjects known to the first set of subjects and so on, is a(n) ____ sample.
a. quota
b. snowball
c. heterogeneity
d. expert
Deviant-case analysis attempts to minimize
a. errors of observation.
b. the difficulties of making inferences.
c. reactivity.
d. statistical bias.
Two variables interact when
a. there are main effects
b. there are no main effects
c. both variables are affected equally by some third factor.
d. the effect of one independent variable depends on the level of the other independent variable
In an experiment, manipulation of the independent variable requires ____.
a. creating one treatment condition defined by one level of the independent variable
b. creating at least two treatment conditions defined by two different levels of theindependent variable
c. creating at least three treatment conditions defined by three different levels of theindependent variable
d. measuring two separate variables to determine how they are related
Any sample that focuses on diversity or variety is known as a(n) ____ sample.
a. quota
b. snowball
c. heterogeneity
d. expert
Correlation coefficients vary from
a. 0.0 to 1.0.
b. -1.0 to 0.0.
c. -1.0 to 1.0
d. -10.0 to 10.0
In a two-way factorial ANOVA, the formula for calculating dfAB is
a. (AB - 1)(N - 1)
b. n - AB
c. n - 1
d. (A 1)(B 1)
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