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) .If we wanted to have a greater degree of confidence in the calculated interval,what would have to happen to its length?

A) The interval would be shorter.
B) The margin of error would decrease.
C) The confidence level would have a smaller value.
D) The sample size would go up.
E) The interval would increase in length.