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Calculate the two-sided 95% confidence interval for the population standard deviation (sigma) given that a sample of size n-20 yields a sample standard deviation

Calculate the two-sided 95% confidence interval for the population standard deviation (sigma) given that a sample of size n-20 yields a sample standard deviation of 15.86 Your answer: 19.68 sigma 36.30 6.91 sigma 4.55 17.21

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