Question: A manufacturing company produces valves in various sizes and shapes
A manufacturing company produces valves in various sizes and shapes. One particular valve plate is supposed to have a tensile strength of 5 pounds per millimeter (lbs/mm).The company tests a random sample of 42 such valve plates from a lot of 650 valve plates. The sample mean is a tensile strength of 5.0611 lbs/mm, and the population standard deviation is 0.2803 lbs/mm. Use α = .10 and test to determine whether the lot of valve plates has an average tensile strength of 5 lbs/mm.
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