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Standard deviation of percentage moisture contents

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Reference no: EM132518865

A sample consists of 21 specimens, each taken by a standard procedure from a different filter cake on an industrial filter. Moisture contents of the specimens were measured. Plotting the data on normal probability paper indicated negligible departure from normal distribution. The sample standard deviation of percentage moisture contents was found to be 3.21. Find the two-sided 90% confidence limits (with equal probabilities in the two tails) for the standard deviation of percentage moisture contents.

Reference no: EM132518865

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