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A statistician wishes to test the claim that the standard deviation of the weights of firemen is less than 25 pounds. To do so, she

A statistician wishes to test the claim that the standard deviation of the weights of firemen is less than 25 pounds. To do so, she selected a random sample of 20 firemen and found s = 23.2 pounds.

Assuming that the weights of firemen are normally distributed, if the statistician wanted to test herresearch hypothesisat the .05 level of significance, what is the critical value?

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