An instructor would like to examine the effect of using handouts during lecture on student's grades. Usually no handouts are used and the mean final...

An instructor would like to examine the effect of using handouts during lecture on student's grades. Usually no handouts are used and the mean final grade in the class is μ = 80. This semester, the instructor uses handouts during lecture and the mean final grade in the class of n = 41 students is M = 82.5 with a standard deviation of s = 6.

a. Is there sufficient evidence to conclude that handouts significantly change overall grades (α .05)? What is the effect size (i.e., d and r2)?

b. Is there sufficient evidence to conclude that handouts significantly improve overall grades (α .05)?

(Hint: Step 3 and effect size will be the same). Remember: μ = 80, n = 41, M = 82.5, s = 6