Why does a good experiment include a control group?
a. it increases the number of people in the study, and hence, the generalizability of the results
b. it gives us information about how participants would perform without experiencing the experimental treatment
c. it eliminates the effects of external validity
d. control groups have been an established part of scientific tradition for many decades
B
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Congress no longer needs to declare war because
a. this is now the responsibility of the United Nations. b. the president can fight a war without a formal declaration. c. it is no longer necessary with an all-volunteer military. d. the Constitution has been amended to make this unnecessary. e. the decision lies in the hands of Homeland Security.
Compared to Texans who identify themselves as Democrats, those who identify themselves as Republicans are more likely to __________
a. support gay marriage b. support capital punishment c. support in-state tuition for undocumented immigrants d. believe abortion should be legal under all circumstances