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Solution: The tensile strength of a fiber used in manufacturing cloth is of interest to the purchaser. Previous experience indicates that the standard

Question: The tensile strength of a fiber used in manufacturing cloth is of interest to the purchaser. Previous experience indicates that the standard deviation of tensile strength is 2 psi. A random sample of 8 fiber specimens is selected and the average tensile strength is found to be \(127 \mathrm{psi}\) .

  1. Test the hypothesis that the mean strength equals 125 psi versus the alternative that the mean exceeds 125 psi. Us e significance level of 0.05.
  2. Calculate the p-value for the test.

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