The normal probability plot is a graphical technique for normality testing: assessing whether or not a data set is approximately normally distributed.
The data are plotted against a theoretical normal distribution in such a way that the points should form an approximate straight line. Departures from this straight line indicate departures from normality.
The normal probability plot is a special case of the Q–Q probability plot, for the case of a normal distribution.
Read more about Normal Probability Plot: Definition, Other Distributions, Examples
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