A researcher conducts a study in which the population variance of difference scores between two groups is unknown. What type of t test is most appropriate for this study?
A. one-sample t test
B. two-independent-sample t test
C. related-samples t test
D. there is not enough information to answer this question
Ans: C
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Culture has a pervasive influence on child development. Which one of the following best describes the general nature of a culture?
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