Expected Counts in Two-Way Tables

AP Statistics· difficulty 4/5

A 2\times2 table: row totals 60, 40; column totals 30, 70; n=100. Expected count for cell (1,1) =

A
$60$
B
$12$
C
$30$
D
$18$
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Explanation

E = 60\cdot30/100 = 18.

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