In Testing the Difference Between Two Population Means, Using Two $\bar { X } _ { 1 } - \bar { X } _ { 2 }$

question 48

Multiple Choice

In testing the difference between two population means, using two independent samples, the sampling distribution of the sample mean difference $\bar { X } _ { 1 } - \bar { X } _ { 2 }$ is normal if the:

• A)sample sizes are both greater than 30.
• B)populations are normal.
• C)populations are non-normal and the sample sizes are large.
• D)All of these choices are correct.

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