Chi square test
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Chi square test

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Chi square test Chi square test Document Transcript

  • Chi Square Test 1. 2. 3. 4. 5. What is the problem that geneticist face? What’s the example? Describe what a “goodness of fit” is. What is a “null hypothesis” What is the example? Write down Chi Formula. What do all the parts stand for? Fill in the following chart: (I like organizing my problems like this, it keeps my math organized; however if you prefer the setup on the PPT feel free to use that) Phenotype Purple Expected Observed Chi Value (show math) White Total: 400 6. 7. 8. 9. 10. 11. 12. 13. 14. 400 1.333 Sum up what the Chi-Square Distribution is all about. Can you ever determine if an answer is wrong? If not what can you do? What are the two ways for having a high Chi value? What is reasonable in science? How do we phrase it? And what is the probability “p” value? What are degrees of freedom and how is it calculated? What are the degrees of freedom for our example? How do you find the Critical Chi-square value? When would you “reject the null hypothesis”? When do you “fail to reject”? Using the Chart what is the critical value for our example? If you need to see another example continue to take a look at the one from Mendel. If you feel pretty good start with the problem WS.