Chi-square distribution facts for kids
In probability theory and statistics, the chi-square distribution is one of the most widely used theoretical probability distributions. It is used in statistical significance tests. It is useful, because it is relatively easy to show that certain probability distributions come close to it, under certain conditions. One of these conditions is that the null hypothesis must be true. Another one is that the different random variables (or observations) must be independent of each other.
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Chi-square distribution Facts for Kids. Kiddle Encyclopedia.