Question

1. An assembly line produces widgets with a mean weight of 10 and a standard deviation of 0.200. A new process supposedly will produce widgets with the same mean and a smaller standard deviation. A sample of 20 widgets produced by the new method has a sample standard deviation of 0.126. At a significance level of 10%, can we conclude that the new process is less variable than the old? State appropriate null and alternative hypotheses.

Answer 1

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