A random sample of 25 items is selected from population 1 fo

A random sample of 25 items is selected from population 1 for which ?₁ = 2.5 and ?₁² = 0.25. A random sample of 26 is selected from population 2 for which ?₂ = 2.0 and ?₂² = 0.16. The two samples are independent of each other.

What is the mean (expected value) of the sampling distribution of Xbar₁ - Xbar₂? If your answer is not a whole number, give 2 decimal places.

Solution

The mean of the sampling distribution of difference between means is