Statistics for Two Categorical Variables

AP Statistics· difficulty 2/5

The table shows disease outcomes by vaccination status.

Vaccine vs Disease Group Sick Well Total Vac 10 490 500 No 50 450 500 Total 60 940 1000

Compare the conditional risks of being sick.

  • A

    Vaccinated 0.02; Unvaccinated 0.10

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  • B

    Cannot be computed

  • C

    Vaccinated 0.10; Unvaccinated 0.02

  • D

    Both 0.06

Explanation

P(sick|vac) = 10/500 = 0.02; P(sick|no vac) = 50/500 = 0.10.

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