The Breaking Strength of Yarn Used in the Manufacture of Woven

Multiple Choice

The breaking strength of yarn used in the manufacture of woven carpet material is Normally distributed with  = 2.4 psi.A random sample of 16 specimens of yarn from a production run was measured for breaking strength,and based on the mean of the sample ,a confidence interval was found to be (128.7,131.3) .What is the confidence level,C,of this interval?

A) 0.95
B) 0.99
C) 0.90
D) 0.97
E) It can't be determined with the information provided.