The tensile strength of 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 eight fiber specimens is selected, and the average tensile strength is found to be 127 psi.

a. Build a 95% lower confidence interval in the mean tensile strength.

b. What can you conclude?

Transcribed Image Text:

= 127, O = 2