A supplier sells synthetic fibers to a manufacturing company. A simple random sample of 81 fibers is
Question:
a. Find a 95% confidence interval for the mean breaking strength of all the fibers in the shipment.
b. Find a 99% confidence interval for the mean breaking strength of all the fibers in the shipment.
c. What is the confidence level of the interval (27.5, 30.5)?
d. How many fibers must be sampled so that a 95% confidence interval specifies the mean to within ±1 lb?
e. How many fibers must be sampled so that a 99% confidence interval specifies the mean to within ±1 lb?
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a X 29 s 9 n 81 z025 196 The confidence interval is 29 196981 or 2704 3096 b X 29 s 9 n 8...View the full answer
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Saud Ur Rehman
Evaluating manufacturing processes by designing and conducting research programs; applying knowledge of product design, fabrication, assembly, tooling, and materials; conferring with equipment vendors; soliciting observations from operators. Developing manufacturing processes by studying product requirements; researching, designing, modifying, and testing manufacturing methods and equipment; conferring with equipment vendors. Keeping equipment operational by coordinating maintenance and repair services; following manufacturer's instructions and established procedures; requesting special service.
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