Changes

<math>Average Deviation =\sum_{i=1}^{n} \frac{xi-\bar{x}}{n}</math>

<math>Average Deviation =\sum_{i=1}^{n} \frac{xi-\bar{x}}{n}</math>

*<math>\=\sum_{i=1}^{columns}</math> <br/>

*The <math>\chi^2</math> test first calculates a <math>\chi^2</math> statistic using the formula:

<math>\chi^2 = \sum_{i=1}^{columns} \sum_{j=1}^{rows} \frac{(observed ij-expected ij)^{2}}{grand total}</math>

<math>\chi^2 = \sum_{i=1}^{columns} \sum_{j=1}^{rows} \frac{(observed ij-expected ij)^{2}}{grand total}</math>

*Here <math>xi</math> is the observation.  

*Here <math>xi</math> is the observation.