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How to decide to run a parametric or non-parametric test
Are both variables scaled?
Are both distributions
Normal?
Both Scaled
At least 1 variable is
Ordinal, or Nominal
Both Normal
At least 1 Skewed
Choose a
Parametric Test
Are both sample sizes
greater than 30?
Both
Greater
than 30
Choose a
Non-Parametric Test
At least 1
is Less
than 30

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Quick reminder parametric - nonparametric relationship

  • 1. How to decide to run a parametric or non-parametric test Are both variables scaled? Are both distributions Normal? Both Scaled At least 1 variable is Ordinal, or Nominal Both Normal At least 1 Skewed Choose a Parametric Test Are both sample sizes greater than 30? Both Greater than 30 Choose a Non-Parametric Test At least 1 is Less than 30