The specific treatment conditions that are used in an experiment are called the ____.
a. levels of the independent variable
b. levels of the dependent variable
c. control groups
d. manipulation checks
A ____ indicates the upper and lower bounds of the estimate of a statistic.
a. span of variability
b. probability interval
c. range
d. confidence interval
In general, basic researchers assume that the same mental processes cannot occur in different physical situations.
Indicate whether the statement is true or false
In a study examining the effects of gender (male or female) and major (psychology, computer science, philosophy, or biology) on college students' willingness to perform community service work, how many interaction effects are possible?
a. 5
b. 1
c. 2
d. 6
Dr. Nguyen is studying how the quality of breakfast influences academic performance for elementary school children. A sample of 100 children is selected. Fifty children are provided with a nutritious breakfast when they arrive at school each morning. The other 50 children are given a doughnut each morning. After three months, Dr. Nguyen records the academic achievement level for each child and compares the two groups of scores. In this example, how many levels are there for the independent variable?
a. 1
b. 2
c. 50
d. 100
A clinical trial is most likely to use a ____ sample.
a. nonprobability
b. probability
c. random
d. simple
A generalization is a relatively broad statement lacking specifics that cannot be tested directly.
Indicate whether the statement is true or false
For a two-way factorial design, there is the possibility of _____ main effect(s) and _____ interaction effect(s).
a. 2; 4
b. 2; 2
c. 2; 1
d. 1; 2
The measured variable in an experiment is the ____ variable.
a. independent
b. dependent
c. extraneous
d. confounding
What type of samples are selected on the basis of researcher judgment?
a. nonprobability
b. probability
c. random
d. simple
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