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Confidence intervals for the variance

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Reference no: EM132529324

A random sample of the lifetimes of 20 inexpensive wristwatches has a standard deviation of 4.2 months. Assume the variable is normally distributed. Use the chi-square distribution table to find any chi-square values to three decimal places. Round your final answers to one decimal place.

Question:

Find the 90% confidence intervals for the variance and standard deviation.

Reference no: EM132529324

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