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

question 51

True/False

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.

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