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Dr Jackson Is Studying Sibling Rivalry

Question 90

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Dr. Jackson is studying sibling rivalry. One of his current subjects is Lisa. Lisa, and other age-peers, have been assessed every five years since 1970. Another of Dr. Jackson's subjects is Michael. Michael is part of a second group that has been assessed every five years since 1985. What kind of research design is Dr. Jackson using?


A) a cross-sectional study
B) an experimental study
C) a longitudinal study
D) a sequential study

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