Two hundred thirty-one students were randomly assigned to read either digital (n1=119) or paper (n2=112) versions of a leadership essay. Students were then given a 10-item multiple-choice test of recall. The digital students scored an average of x¯1=72 while the paper students scored an average of x¯2=78. Their standard deviations were respectfully: s1=12 and s2=16.   Give an estimate of the difference in the mean scores μ1−μ2 of students who read the paper digitally versus reading it on paper. a. -6 b. 6 c. 4 d. 3

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