Using Normal Probability Plot to Check Normality Section
If the sample size is less than 30, one needs to use a Normal Probability Plot to check whether the assumption that the data come from a normal distribution is valid.
- Normal Probability Plot
- The Normal Probability Plot is a graph that allows us to assess whether or not the data comes from a normal distribution.
This plot should be used as a guide for us to assess if the assumption that the data come from a normal distribution is valid or not. It should not be used to “test” an assumption.