Expected Counts in Two-Way Tables

AP Statistics· difficulty 3/5

Three populations are sampled (n1=80, n2=80, n3=80). Column totals (favor/oppose) are 120 and 120.

Three Populations, Two Outcomes Favor Oppose Total P1 P2 P3 Total 80 80 80 120 120 240

What is the expected count for each cell?

  • A

    60

  • B

    40

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  • C

    80

  • D

    30

Explanation

Expected = (row × col)/total = (80 × 120)/240 = 40 for every cell.

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