A confound is something that
a) decreases sample size.
b) increases internal validity.
c) makes results clearer and easier to understand.
d) obscures the relationship between two variables.
Question 2
What has been shown to be related to the changes in marijuana consumption among high school students?
a) Social factors that foster marijuana use, such as joblessness or economic factors.
b) Media images supporting cigarette smoking.
c) Lowered purity of marijuana available in the market.
d) Beliefs about the risks associated with marijuana smoking.
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