The strength of steel wire made by an existing process is normally distributed with a mean of 1250… 1 answer below »

The strength of steel wire made by an existing process is normally distributed with a mean of 1250… 1 answer below »

The strength of steel wire made by an existing process is normally distributed with a mean of 1250 and a standard deviation of 150. A batch of wire is made by a new process, and a random sample consisting of 25 measurements gives an average strength of 1312. Assume that the standard deviation does not change. Is there evidence at the 1% level of significance that the new process gives a larger mean strength than the old?

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