Population 1 has a mean of 20 and a variance of 100. Population 2 has a mean of 15 and a variance of 64. You sample 20 scores from Pop 1 and 16 scores from Pop 2. What is the mean of the sampling...

Population 1 has a mean of 20 and a variance of 100. Population 2 has a mean of 15 and a variance of 64. You sample 20 scores from Pop 1 and 16 scores from Pop 2. What is the mean of the sampling distribution of the difference between means (Pop 1 - Pop 2)?