A lumber mill is tested for consistency be measuring the variance of board thick

Question

A lumber mill is tested for consistency be measuring the variance of board thickness. The target accuracy is a variance of 0.0025 square inches or less. If 22 measurements are made and their variance is 0.004 square inches, is there enough evidence to reject the claim that the standard deviation is within the limit at = 01? No, since the chi^2 test value 33.60 is less than the critical value 38.932 Yes, since the chi^2 test value 7.33 is less than the critical value 38.932 No, since the chi^2 test value 33.60 is less than the critical value 40.289 Yes, since the chi^2 test value 7.33 is less than the critical value 40.289

Explanation / Answer

Here

Test Statistic= (21*0.004)/0.0025)= 33.60

Critical value at 0.01 level and degree of freedom= 21 is 38.932

So, Option A is correct

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