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    Statistics: 95% Confidence Interval

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    Question: There are 300 welders employed at the Maine Shipyards Corporation. A sample of 30 welders revealed that 18 graduated from a registered welding course. Construct the 95 percent confidence interval for the proportion of all welders who graduated from a registered welding course.

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    Sample Proportion = 18/30 = 0.6

    Since sample proportion = true proportion, true ...

    Solution Summary

    This solution is comprised of a concise, step by step response which demonstrates how to construct a 95% confidence interval. All calculations are provided.