If Two Random Samples of Sizes $n _ { 1 }$

question 21

Multiple Choice

If two random samples of sizes $n _ { 1 }$ and $n _ { 2 }$ are selected independently from two populations with means $\mu _ { 1 }$ and $\mu _ { 2 }$ , then the mean of the sampling distribution of the sample mean difference, $\bar { X } _ { 1 } - \bar { X } _ { 2 }$ , equals:

• A)\(\mu_{1}+\mu_{2}\)
• B) \(\mu_{1}-\mu_{2}\)
• C) \(\mu_{1}/\mu_{2}\)
• D) \(\mu_{1}\mu_{2}\) :

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