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The breaking strength of yarn used in the manufacture of woven carpet material is Normally distributed...

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Statistics

The breaking strength of yarn used in the manufacture of wovencarpet material is Normally distributed with 2.4 psi (pound-forceper square inch). A random sample of 16 specimens of yarn from aproduction run were measured for breaking strength and a confidenceinterval for the breaking strength of yarn was found to be (128.7,131.3).

(a) What is the confidence level, C, of this interval?

A. 90% B. 92% C. 95% D. 96% E. 97% F. 98.5% G. 99% H. None ofAbove

(b) What is the margin-of-error of this study?

A. 130 B. 65 C. 2.6 D. 1.3 E. None of Above F. Unable todetermine with the information provided.

(c) Is it possible that the breaking strength of yarn used inthe manufacture of woven carpet is 120 psi?

A. Yes B. No C. Unable to determine with the informationprovided.

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