04BIS1012012RecombinLect4b

L rodriguez 2012 50 interpreting the chi square test

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Unformatted text preview: y are due to chance only (see 2 Table). Before selecting the appropriate probability, we must first choose the "degree of freedom" or df for this experiment. Degrees of Freedom is a measure of the number of categories that are independent of each other, typically n - 1 where n is the total number of categories. In this experiment, there are 4 progeny categories, or a df = 3. To interpret the meaning of a March 19, 2012 BIS101001, Spring 2012--Genes and Gene Expression, R.L. Rodriguez 2012 51 Interpreting Probabilities from a Chi Square (2) Table Critical Values of the 2 Distribution March 19, 2012 BIS101001, Spring 2012--Genes and Gene Expression, R.L. Rodriguez 2012 52 Interpreting Probabilities from a Chi Square (2) Table From the table of 2 values, at 3 degrees of freedom, 276.5 is large and gives a probability (p) of 0.005 or, 0.5%. This means that the probability that the deviations between observed and expected progeny are due to chance only, is 0.5%. Therefore, we must reject our h...
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