Representing Two Categorical Variables

AP Statistics· difficulty 2/5

The table cross-classifies allergy by exposure.

Allergy by exposure Exposure Allergy None Total Yes 45 155 200 No 15 285 300 Total 60 440 500

Among those with allergies, what proportion was exposed?

  • A

    60/500 = 0.12

  • B

    200/500 = 0.40

  • C

    45/60 = 0.75

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  • D

    45/200 = 0.225

Explanation

Conditioning on Allergy = Yes column total of 60: 45 of 60 had exposure, giving 0.75.

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