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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The Answer of 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

If Two Random Samples of Sizes N1 and N2 Are μ\muμ

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