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Chi-square distribution

Chi-square distribution

a distribution in which a variable is distributed like the sum of the the squares of any given independent random variable, each of which has a normal distribution with mean of zero and variance of one. The chi-square test is a statistical test based on comparison of a test statistic to a chi-square distribution. The oldest of these tests are used to detect whether two or more population distributions differ from one another.

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... seed colour loci segregating normally? The 5% critical values of the Chi-squared distribution are: d.f. 1 2 3 4 5 6 χ2 3.84 5.99 7.82 9.49 11.07 12.59 no calculator but can ...

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by chousta
Sat Aug 23, 2008 7:14 am
Forum: Genetics
Topic: Help
Replies: 1
Views: 3212

Re: Draco's Biology revision

... period of time—the next week for flu, or the next year for cancer or schistosomiasis, say. Mortality is the incidence of death due to a disease ... the critical chi-squared, then the data is consistent with the expected distribution of phenotypes, otherwise the data are not consistent with the ...

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by blcr11
Wed Jan 16, 2008 12:33 pm
Forum: General Discussion
Topic: Draco's Biology revision
Replies: 7
Views: 3188

help on correct descriptive statistics of a project

... tests, like standard t-tests and F-tests, assume an underlying normal distribution with random error. Chi-squared and t-statistics, in particular, can be strongly biased by departures from normality. ...

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by blcr11
Thu Dec 06, 2007 11:24 am
Forum: General Discussion
Topic: help on correct descriptive statistics of a project
Replies: 4
Views: 3707

The Fiber Disease

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by Nadas Moksha
Wed Dec 06, 2006 4:55 pm
Forum: Human Biology
Topic: The Fiber Disease
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