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The sample of 12 items from population 2 yields a mean of

A statistician wishes to determine the difference between two population means. A sample of 10 items from Population #1 yields a mean of 185 with a standard deviation of 20. The sample of 12 items from Population #2 yields a mean of 200 with a standard deviation of 25. Assume that the values are normally distributed in each population. How many degrees of freedom are there for this test?

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Basic Statistics: The sample of 12 items from population 2 yields a mean of

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