2x2 table
For 2x2 table ,if expected frequency of each cell is more than 5,and total numbers n>40,we should choose the Peason,s chi-square test
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If expected frequency of any cell1<E<5 and n>40,we should choose Yate,s continuity correction chi-square test 公卫家园
If E<1 in any cell or n<40 or P value of test is close to the test level,we should use Fisher’s exact test
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