APFIVE Mean of the Difference in Sample Means
What is the mean of the sampling distribution of the difference in sample means $$\bar{x}_1 - \bar{x}_2$$?
A
$$\mu_1 / \mu_2$$
B
$$\mu_1 - \mu_2$$
C
$$\mu_1 \times \mu_2$$
D
$$\mu_1 + \mu_2$$
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