Which of the following might contain a serious threat to the external validity of a study?
a. a survey with a return rate of 30%
b. statistically significant findings in both the clinical setting and at home
c. evidence of a consistent effect in the winter and the spring
d. evidence that shows SAT scores and GPA change with improved study habits
A
Political Science
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Which of the following presidents held the first live, television presidential news conference?
A) Harry Truman B) Dwight Eisenhower C) John F. Kennedy D) Richard M. Nixon E) Franklin Roosevelt
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Tribal gaming has almost eliminated poverty among Native Americans in California.
Answer the following statement true (T) or false (F)
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