**Type I error (alpha**

**)**: The probability of finding a difference between two groups when there are none. On the other hand,

**one minus alpha**, is the probability of not finding a difference when there are none. This one minus alpha is also known as

**Confidence Level.**

**Typer II error (beta)**: The probability of not finding a difference between two groups when there is a difference. On the other hand,

**one minus beta**, is the probability of finding a difference when there is one. This one minus beta is also known as

**Power of the study**.

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