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determine the critical value for a left-tailed test of a population standard deviation for a sample of size n=21 at the a=0.05 level of significance.
determine the critical value for a left-tailed test of a population standard deviation for a sample of size n=21 at the a=0.05 level of significance. A=31.31 B= 10.851 C=32.671 D=11.591
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