1. An instructor would like to examine the effect of usinghandouts during lecture on student’s grades. Usually no handoutsare used and the mean final grade in the class is μ = 80. Thissemester, the instructor uses handouts during lecture and the meanfinal grade in the class of n = 41 students is M = 82.5 with astandard deviation of s = 6.
a. Is there sufficient evidence to conclude that handoutssignificantly (α = .01) change overall grades? If so, compute theeffect size (r2) and explain what it tells you about thedifferences in grades due to handouts.
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b. Is there sufficient evidence to conclude that handoutssignificantly (α = .01) improve overall grades? (Hint: Step 3 willbe the same as part a.)? If so, compute the effect size(r2) and explain what it tells you about the differencesin grades due to handouts.
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