chi_square

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Formula First determine thenumber of eachphenotype that havebeen observed and howmany would beexpected given basicgenetic theory. Then calculate the chisquarestatistic using thisformula. You need tomemorize the formula!( obs exp)2exp2
FormulaThe “Χ” is the Greek letterchi; the “∑” is a sigma; itmeans to sum the followingterms for all phenotypes.“obs” is the number ofindividuals of the givenphenotype observed; “exp”is the number of thatphenotype expected fromthe null hypothesis.Note that you must use thenumber of individuals, thecounts, and NOT proportions,ratios, or frequencies.( obs exp)2exp2
Page 2 and 3: Chi-Square Test A fundamental probl
Page 4 and 5: Goodness of Fit Mendel had no way o
Page 8 and 9: ExampleAs an example, you count F2
Page 10 and 11: Chi-Square DistributionAlthough the
Page 12 and 13: Chi-Square Distribution, p. 3Note t
Page 14 and 15: The Critical Question How do you te
Page 16 and 17: ReasonableWhat is a “reasonable
Page 18 and 19: Degrees of Freedom A critical facto
Page 20 and 21: Chi-Square Table
Page 22 and 23: Another Example: from Mendelphenoty
Page 24 and 25: Calculating the Chi-Square ValueUse
Page 26 and 27: Chi-Square Table

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