Sample Size Sample Mean Sample SD Population Population 2 n₁ = 20 n2 = 25 X₁ = 84.34 X2 = 79.78 S1 S₁ = 9.08 S₂ = 10.06

The university professor is interested in comparing how much students learn in online versus traditional (on-ground) courses. The students in each type of course took a test at the end of the course. The professor wants to know whether students in the on-ground course achieved better results using α = 0.05. In this case, the two types of populations are Population 1: Students in the traditional on-ground course and Population 2: Students in the online course. Find the 95% confidence interval for the difference of the true average scores μtraditional − μonline.