A Lumber Mill Is Tested for Consistency by Measuring the Variance

question 45

Multiple Choice

A lumber mill is tested for consistency by measuring the variance of board thickness. The target accuracy is a variance of 0.0035 square inches or less. If 30 measurements are made and their variance is 0.006 square inches, is there enough evidence to reject the claim that the standard deviation is within the limit at = .01?

• A) Yes, since the χ² test value 49.71 is greater than the critical value 49.588.
• B) No, since the χ² test value 9.23 is less than the critical value 49.588.
• C) Yes, since the χ² test value 49.71 is less than the critical value 50.892.
• D) No, since the χ² test value 9.23 is less than the critical value 50.892.

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