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 were measured for breaking strength, and based on the mean of the
sample, x, a confidence interval was found to be (128.7, 131.3).
(a) What is the confidence level, C, of this interval?
(b) If we want to increase our confidence, what would happen to the length of the
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