Suppose we randomly selected 250 people,and on the basis of their responses to a survey we assigned them to one of two groups: high-risk group and low-risk group.We then recorded the blood pressure for the members of each group.Such data are called:
A) observational.
B) experimental.
C) matched.
D) None of these choices.
Correct Answer:
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Q25: The equal-variances test statistic of 
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