The numerator or MST degrees of freedom are 3 and the denominator or MSE degrees of freedom are 18. The total number of observations in the completely randomized design must equal 20.

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In a completely randomized design, the total number of observations equals the sum of the degrees of freedom for MST (Mean Square Treatment) and MSE (Mean Square Error) plus 1. Given MST degrees of freedom are 3 and MSE degrees of freedom are 18, the total number of observations would be 3 + 18 + 1 = 22.

The Numerator or MST Degrees of Freedom Are 3 and the Denominator