Confidence interval


The data table below provides cost overruns (actual costs minus estimated costs) in thousands of dollars on similar-size engineering projects completed this year. Calculate the following:

a.    A 95 percent confidence interval for the average overrun this process would deliver over a long time period, assuming it is stable.

a.     A 99 percent confidence interval for the same average.

Explain why this is a different width than the 95 percent interval.









































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