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A machine produces metal rods used in automobile suspension system. A random sample of 16 rods...

A machine produces metal rods used in automobile suspension system. A random sample of 16 rods is selected, and the diameter measured. The resulting data in millimeters are shown here: 8.23 8.58 8.42 8.18 8.86 8.25 8.69 8.27 8.19 8.96 8.33 8.34 8.78 8.32 8.68 8.41 Calculate a 95% confidence interval on the diameter variance. With 95% confidence, what is the left-value of the confidence interval on the diameter variance?

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