3. An ANOVA procedure is applied to data obtained from 6 independent samples where each sample contains 20 observations. The degrees of freedom for the critical value of F are
(A) 6 numerator and 20 denominator degrees of freedom
(B) 5 numerator and 20 denominator degrees of freedom
(C) 5 numerator and 114 denominator degrees of freedom
(D) 6 numerator and 20 denominator degrees of freedom

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