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Degrees of freedom

chapter 11

Subject: 
Statistics
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Statistics
Statistical tests
Categorical data
Pearson's chi-squared test
Goodness of fit
Chi-squared distribution
Chi-squared test
Student's t-test
Degrees of freedom
Probability distribution
Statistic

AP Statistics Chapter 11 Outline 11.1 Chi-Square Goodness-Of-Fit Tests Chi-Square Statistic The chi-square statistic is a measure of how far the observed counts are from the expected counts: Where the sum is over all possible values of the categorical variable The Chi-Square Distribution The chi-square distributions are a family of distributions that take only positive values and are skewed to the right. A particular chi-square distribution is specified by giving its degrees of freedom. The chi-square goodness-of-fit test uses the chi-square distribution with degrees of freedom = the number of categories - 1. The Chi-Square Goodness-of-Fit Test
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