In the Kansas City study, how many preschool-age families were observed?

In the Kansas City study, how many preschool-age families were observed?

• A. 60
• B. 23
• C. 100
• D. 42

Answer: (D)

Focus on sample size—the number of families actually included in the study. In the Kansas City study, forty-two preschool-age families were observed. This count represents how many distinct families contributed data, not the total number of children or individual observations within those families. The size matters because it affects how confidently we can generalize the findings to a broader population; with forty-two families, the study has a specific level of precision and power for detecting patterns. The other numbers in the options don’t match the reported sample size for families in this study, so they aren’t the correct count.

Focus on sample size—the number of families actually included in the study. In the Kansas City study, forty-two preschool-age families were observed. This count represents how many distinct families contributed data, not the total number of children or individual observations within those families. The size matters because it affects how confidently we can generalize the findings to a broader population; with forty-two families, the study has a specific level of precision and power for detecting patterns. The other numbers in the options don’t match the reported sample size for families in this study, so they aren’t the correct count.