Final answer:
To determine the critical value in ANOVA, you need the number of groups to find the numerator degrees of freedom and the total number of observations to find the denominator degrees of freedom. These values are compared against the F distribution table at the chosen significance level.
Step-by-step explanation:
To determine the critical value for comparing the test statistic of an ANOVA (Analysis of Variance), two pieces of information are required:
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The F-statistic is then compared against a critical value from the F distribution table at a selected significance level (typically α = 0.05) to determine whether to reject the null hypothesis.