1. An instructor would like to examine the effect of using handouts during lecture on student’s...

1. 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 (α = .01) change overall grades? If so, compute the effect size (r²) and explain what it tells you about the differences in grades due to handouts.

b. Is there sufficient evidence to conclude that handouts significantly (α = .01) improve overall grades? (Hint: Step 3 will be the same as part a.)? If so, compute the effect size (r²) and explain what it tells you about the differences in grades due to handouts.

Solutions

Expert Solution

(a)

Conclusion: There is not sufficient evidence to conclude that handouts significantly (α = .01) change overall grades.

(B)

Conclusion : There is sufficient evidence to conclude that handouts significantly (α = .01) improve overall grades.

The effect size will be:

milcah answered 1 month ago

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