11-20. A researcher wants to check the variability of a device used to measure the light intensity...

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11-20. A researcher wants to check the variability of a device used to measure the light intensity (in lumens) emitted from a certain welding machine.

Nine independent measurements are recorded: 546, 609, 550, 585, 570, 577, 580, 540, and 561. If the measurements recorded by this instrument are approximately normally distributed, find a 95% confidence interval for σ2.

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