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A sample of 15 concrete cylinders was taken randomly from the production of a plant. The strength of

A sample of 15 concrete cylinders was taken randomly from
the production of a plant. The strength of each specimen was determined, giving
a sample standard deviation of 215 kN/ m2 . Find the 95% confidence
interval (with equal probabilities in the two tails) for standard deviation of
the strengths. Assume the strengths follow a normal distribution.

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