Standard deviation-molder operating satisfactorily

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Reference no: EM1322061

An injector molder produces plastic pens. The process is designed to produce pens with a mean weight equal to 0.250 ounce. To investigate whether the injection molded is operating satisfactorily, 40 pens were randomly sampled with a mean of 0.2525 and a standard deviation of .0022. Test at 5% and 1% whether the molder is operating satisfactorily.

Reference no: EM1322061

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