nps20DC.tmp

# nps20DC.tmp - A ): ratio is not 1 : 2 : 1 Character...

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1 Outline of lecture 3. (1) Testing statistical significance of the agreement between observed and theoretical segregation ratio.

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2 Goodness of fit test 2 = Σ (Observed number – expected number) 2 /expected number The expected number, e.g., for the 3:1 ratio: The expected number for the class of 3 = Total number x 3/4 The expected number for the class of 1 = Total number x 1/4 Null hypothesis (H 0 ): ratio is 1 : 2 : 1 Alternative hypothesis (H

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Unformatted text preview: A ): ratio is not 1 : 2 : 1 Character Observed Expected (O-E) 2 (O – E) 2 /E red 182 160 484 3.0 pink 61 80 361 4.5 white 77 80 9 0.1 Total 320 320 7.6 P = Conclusion: 3 Next test: H ratio 9 : 3 : 4 H A ratio not 9 : 3 : 4 Character Observed Expected (O-E) 2 (O – E) 2 /E Red 182 180 4 0.02 Pink 61 60 1 0.02 White 77 80 9 0.11 Total 320 320 0.15 P = Conclusion: 4 Chi-square probability table...
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## This note was uploaded on 09/29/2009 for the course NPB NPB 101 taught by Professor Weidner/wingfield during the Spring '08 term at UC Davis.

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nps20DC.tmp - A ): ratio is not 1 : 2 : 1 Character...

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