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    Construct a 95% Confidence Interval

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    A random sample of 85 group leaders, supervisors, and similar personnel at General Motors revealed that, on the average, they spent 6.5 years on the job before being promoted. The standard deviation of the sample was 1.7 years. Construct a 95 percent confidence interval.

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    https://brainmass.com/statistics/confidence-interval/construct-a-95-confidence-interval-295551

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    The solution provides step by step method for the calculation of Confidence Interval

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