# Normality and Equal Variance

Let's learn about normality and equal variance by using plots.

## We'll cover the following

## Normality

Approximate normality can be judged using a **quantile-quantile plot (Q-Q plot)**. This type of plot graphs the quantiles of the distribution of the residuals versus the quantiles of a random sample of normally distributed numbers. This is, so the residuals fall around a straight line when they match the model.

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