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Confidence interval for the population variance

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Reference no: EM131725974

A firm draws a random sample of 18 ball bearings from the day's output. The sample variance of their diameters is 0.009 inches.

i. Construct a 95% confidence interval for the population variance.

ii. Construct a 90% confidence interval for the population variance.

iii. What assumptions underlie the answers in the first two parts of this question

Reference no: EM131725974

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