The breaking strength of yarn used in the manufacture of woven carpet material is Normally distributed with $\sigma$= 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.

Question

The breaking strength of yarn used in the manufacture of woven carpet material is Normally distributed with $\sigma$= 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.

Quizplus · Accepted Answer

The Answer of The breaking strength of yarn used in the manufacture of woven carpet material is Normally distributed with $\sigma$= 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.

The Breaking Strength of Yarn Used in the Manufacture of Woven