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2. A textile engineers want to know how many fabric fibers to test to obtain a 90% confidence interval for the mean tensile strength having

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2. A textile engineers want to know how many fabric fibers to test to obtain a 90% confidence interval for the mean tensile strength having a margin of error of no more than 0.5 psi. From past experience it is known that the range of measurements is approximately 5 psi around the mean. Calculate the necessary sample size. Use a rough estimate of o

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