1.Does alcohol really impair visual and motor skills?Two groups were tested.One was given ethanol, the other a placebo.Use a = .01 to test the claim that there is a difference in the means of the two groups.

Treatment Group

n₁ = 22

n₂ = 22

x₁ = 4.2

x₂ = 1.71

s₁ = 2.20

s₂ = 0.72