### 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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