[Solved] Thirty-five strands of piano wire were selected at random from a recent shipment by the Quality Control Department at Elkins Piano Company. The strands
Question: Thirty-five strands of piano wire were selected at random from a recent shipment by the Quality Control Department at Elkins Piano Company. The strands of piano wire were tested to failure in tests of tensile strength. The average tensile strength of the sample was 30,000 pounds per square inch (psi) with a sample standard deviation of 1,950 psi. Find the 98% confidence interval for the mean tensile strength.
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