BIOL361 Lecture Notes - Lecture 16: Sample Size Determination, Continuity Correction, Contingency Table
24 Apr 2016
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Extrinsic expected frequencies were determined on basis of some extrinsic hypothesis like balanced sex ratio or phenotype frequencies. Q: the student wanted to determine whether the distribution of wingedness in a lab colony was binomially distributed. 150 random samples, each of 8 flie each sample had 8 flies. 42 times there were none left winged in 8 flies. 52 times there was 1 left wing in 8 flies. 38 times there were 2 left wing in 8 flies. 12 times there were 3 left wing in 8 flies. 1 fly had left wing 52 times 52 flies had left wing. 2 flies had left wing 38 times 38 x2 = 76 flies had left wing. Nominal data: 2 way designs (= contingency tables) 2 nominal variables: 2-way designs = referred to as contingency tables. 2-way frequency table (at least 2 rows and 2 columns)
