# Eventmath/Lesson plans/Simpson's Paradox in COVID vaccine efficacy data

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Lesson plan overview
TitleSimpson's Paradox in COVID vaccine efficacy data
Assumed knowledgeFamiliarity with percentages
ActivitiesThe goal is to investigate how Simpson's paradox leads to misleading vaccine efficacy data. Students could also create a graphical display of the data.
Class time15-30 minutes
Source
"There has been lots of talk about recent data from Israel that seem to suggest a decline in vaccine efficacy against severe disease due to Delta, waning protection, or both". Twitter. 2021-08-17. Archived from the original on 2022-08-18.
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