If Two Random Samples of Sizes N₁ and N₂ Are $\mu$

question 68

Multiple Choice

If two random samples of sizes n₁ and n₂ are selected independently from two populations with means $\mu$ ₁ and $\mu$ ₂, then the mean of $\bar { X } _ { 1 } - \bar { X } _ { 2 }$ 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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