If two random samples of sizes 30 and 32 are selected independently from two populations with means 121 and 109, then the mean of the sampling distribution of the sample mean difference, $\bar { X } _ { 1 } - \bar { X } _ { 2 }$ , equals 12.

Question

Quizplus · Accepted Answer

The mean of the sampling distribution of the sample mean difference is equal to the difference in population means, which is 121 - 109 = 12.

If Two Random Samples of Sizes 30 and 32 Are Xˉ1−Xˉ2\bar { X } _ { 1 } - \bar { X } _ { 2 }Xˉ1​−Xˉ2​

If Two Random Samples of Sizes 30 and 32 Are $\bar { X } _ { 1 } - \bar { X } _ { 2 }$