A filling machine at a local soft drinks company is calibrated to fill the cans

Question

A filling machine at a local soft drinks company is calibrated to fill the cans at a mean amount of 12 fluid ounces and a standard deviation of 0.25 ounces. The company wants to test whether the standard deviation of the amount filled by the machine is 0.25 ounces. A random sample of 50 cans filled by the machine reveals a standard deviation of 0.33 ounces. Which is the appropriate test to use? Question 16 options: 1) 2 (chi squared) test of independence 2) Wilcoxon rank sum test 3) 2 (chi squared) test of population variance 4) McNemar test

Explanation / Answer

3) 2 (chi squared) test of population variance is the right way to test variances of single sample from normal populations.

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