Testing hypotheses using a normal distribution is well understood and relatively easy. The simplest chi-squared distribution is the square of a standard normal distribution. So wherever a normal รขโ‚ฌยฆ

The chi-square (รฏโ€กยฒ) distribution is fundamental for goodness-of-fit tests and tests of independence. Its shape is defined by the degrees of freedom (df). The distribution is always non-negative and right รขโ‚ฌยฆ

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