State three reasons for including two or more factors in an experiment.
What will be an ideal response?
(1) to build on previous research, (2) control for threats to validity, and (3) enhance the informativeness of interpretation
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Nicotiana tabacum is to nicotine as Erythroxylum coca is to _____?
a. tobacco b. cocaine c. theophylline d. amphetamine e. alcohol
Membership in an ethnic group is defined by common features such as
a. attitudes, values, and religion. b. cultural heritage, language, and common history. c. genetic variables. d. socioeconomic status and political identity.
The tendency to respond to a new problem with the same approach that helped solve similar problems is termed a(n) ________ _________
Fill in the blank(s) with correct word
One drawback to the cross-sectional approach is its inability to evaluate cohort effects
Indicate whether the statement is true or false