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The diameter of copper shafts produced by a certain manufacturing company process should have a mean...

The diameter of copper shafts produced by a certain manufacturing company process should have a mean diameter of 0.51 mm. The diameter is known to have a standard deviation of 0.0002 mm. A random sample of 40 shafts has an average diameter of 0.509 mm. Test the hypotheses on the mean diameter using α = 0.05.

Math   Statistics-And-Probability   
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