1.1) Assume that a distribution of writing speeds for college students has a mean of ₀ = 300 words per minute and standard deviation of = 80.

I predict that a course in "effective writing strategies" will increase in the mean writing speed (H₁: ₁ - ₀> 0).

What is power if n = 25, = .05 and we assume that = .5?

1.2 ) what is the sample size required to achieve power = .77, assuming ₀ = 10, = 2, and H₁: ₁ - ₀ > 0, for = .05 and = .833.