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 5 psi. A random sample of 15fiber specimens is selected, and the average tensile strength is found to be 180 psi. 0 Test the hypothesis that the mean tensile strength equals 160 psi versus the alternative that the mean exceeds 160 psi. Use C1=0.05. o What is the P-value for this test? 0 Construct a 95% lower confidence interval on the mean tensile strength