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A random sample of 100 workers in one large plant took an average of 12 minutes...

A random sample of 100 workers in one large plant took an average of 12 minutes to complete a task, with a standard deviation of 2 minutes. A random sample of 50 workers in a second large plant took an average of 11 minutes to complete the task, with a standard deviation of 3 minutes. Construct a 95% confidence interval for the difference between the two population mean completion times.

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The 95 % C I is

( 0.21202,1.7879)

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