Construct a 95 confidence interval for the difference


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 averages.

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Basic Statistics: Construct a 95 confidence interval for the difference
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