Biology Module 2 - 3.patterns of inheritance 3.4 determine whether the difference between the observed and expected ratio is significant using the chi squared test

3.4 determine whether the difference between the observed and expected ratio is significant using the chi squared test


chi square formula

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The null hypothesis is the hypothesis that states there is no significant difference between the observed and expected result

Chi square table

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If the chi squared value obtained falls under the 0.05 value or larger (eg 0.10, 0.25....0.99) the value obtained is not significant so you accept the hypothesis.

If the chi squared value falls under a value less than the 0.05 value (eg. 0.01) the value obtained is significant so the hypothesis is rejected.