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School A has higher attendance than School B in both the rainy and dry seasons, yet School B has higher overall attendance because it has more students attending during the high-attendance season. What does this illustrate?

Answer and explanation

Correct answer: Different subgroup weights can reverse the pattern seen in each subgroup

Overall rates are weighted by the number of observations in each group. Different seasonal distributions can reverse an apparent relationship, a phenomenon known as Simpson's paradox.

Related tags

Simpsons ParadoxWeighted AveragesAttendance StatisticsData Interpretation

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