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1 Graph of ?2 distribution with differing degrees of freedom
Each ?2 value is computed by the formula:
?2 = ? (O-E)2
E
where O = observed counts from the sample Equation 1
and E= expected counts based on the hypothesized distribution
1.2 Types of ?2 tests and their purpose
For a single population, to determine if the observed distribution in the population conforms to a specific known distribution or a previously studied distribution, the ?2 test for goodness-of-fit can be used.
An example of this usage include: Mendel’s genetic model predicts that the phenotypic distribution of two phenotypes, each phenotype having a dominant and recessive allele, will follow the ratio of 9:3:3:1...
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