A researcher is examining cooperation between peers by observing children at six years, eight years, and ten years old. If the researcher uses a cross-sectional design and obtains 20 scores for each age, how many children participated in the entire study?
A) 20
B) 40
C) 60
D) 120

Question

Quizplus · Accepted Answer

Since the researcher obtained 20 scores for each age, the total number of children in the study would be:
20 (6-year-olds) + 20 (8-year-olds) + 20 (10-year-olds) = 60 children. Therefore, the best choice is C (60).

A Researcher Is Examining Cooperation Between Peers by Observing Children