If Two Random Samples of Sizes 30 and 45 Are $\bar { X } _ { 1 } - \bar { X } _ { 2 }$

True/False

If two random samples of sizes 30 and 45 are selected independently from two non-normal populations with means of 53 and 57, then the mean of the sampling distribution of the sample mean difference, $\bar { X } _ { 1 } - \bar { X } _ { 2 }$ , equals -4.