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Hypothesis Testing - Mean Diameter of Ball Bearings

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A machine that produces ball bearings is set so that the average diameter is .50 inch. A sample of 10 ball bearings was measured with the results shown here. Assuming that the standard deviation is .05 inch, can we conclude at the 5% significance level that the mean diameter is not .50 inch?

.48 .50 .49 .52 .53 .48 .49 .47 .46 .51

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Solution Summary

Excel spreadsheet attached looks at a sample of 10 ball bearings to test whether their mean diameter is 0.5 inches at a 0.05 significance level.

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