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The Lengths of Steel Rods Produced by a Shearing Process

question 50

Multiple Choice

The lengths of steel rods produced by a shearing process are normally distributed.A random sample of 10 rods is selected; the sample mean length is 119.05 centimetres; and the sample standard deviation is 0.10 centimetres.The 90% confidence interval for the population mean rod length is ___.


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