If we are interested in performing a one-tailed,upper-tail hypothesis test about a population variance where the level of significance is .05 and the sample size is n = 20,the critical chi-square value to be used is 30.1435.

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The critical chi-square value for a one-tailed, upper-tail hypothesis test with a level of significance of .05 and a sample size of n = 20 is 30.1435.

If We Are Interested in Performing a One-Tailed,upper-Tail Hypothesis Test