Chi Square for R by C Table


 
Chi Square=40.54
Degrees of Freedom=4
p-value=0.00000003341
 
Cochran recommends accepting the chi square if:
1. No more than 20% of cells have expected < 5.
2. No cell has an expected value < 1.
 
In this table:
None of 9 cells have expected values < 5.
No cells have expected values < 1.
 
Using these criteria, this chi square can be accepted.
 
Expected value = row total*column total/grand total
 
Rosner, B. Fundamentals of Biostatistics. 5th ed. Duxbury Thompson Learning. 2000; p. 395

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