Expected Counts in Two-Way Tables

AP Statistics· difficulty 3/5

A two-way table records 200 individuals classified by exercise level and reported stress.

Exercise vs Stress (Observed) Low High Total Active Sedentary Total 60 30 90 40 70 110 100 100 200

What is the expected count for Active and Low Stress?

  • A

    60

  • B

    45

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  • C

    50

  • D

    55

Explanation

Expected = (row total × column total)/grand total = (100 × 90)/200 = 45.

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