# Chi-square statistical notation

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*2020-03-30 19:42*

The chisquare statistic measures the difference between actual and expected counts in a statistical experiment. These experiments can vary from twoway tables to multinomial experiments. The actual counts are from observations, the expected counts are typically determined from probabilistic or other mathematical models.The distribution of the chisquare statistic is called the chisquare distribution. The chisquare distribution is defined by the following probability density function: Y Y 0 ( 2 ) ( v2 1 ) e 2 2 chi-square statistical notation

The chisquared test is used to determine whether there is a significant difference between the expected frequencies and the observed frequencies in one or more categories. In the standard applications of this test, the observations are classified into mutually exclusive classes, and there is some theory, or say null hypothesis, which gives the probability that any observation falls into the corresponding class.

A chi square (X 2) statistic is used to investigate whether distributions of categorical variables differ from one another. Basically categorical variable yield data in the categories and numerical variables yield data in numerical form. A chisquare test can be used to test the null hypothesis (i. e. , that the passfail rate is not different for male and female students). ChiSquare Statistic. Just as in a ttest, or Ftest, there is a particular formula for calculating the chisquare test statistic.**chi-square statistical notation** Related Questions More Answers Below. There is no single symbol for chisquared in MS Word. But you can get a chi in symbol font and then put 2 as a superscript. If you go to insert character and select symbol you should be able to find a chi. Or just change the font to symbol and type an x.