One group of accounting students used simulation programs, while another group received a tutorial. Scores on an exam were compared.
(a) Construct a 90 percent confidence interval for the true difference in mean scores, explaining any assumptions that are necessary.
(b) Do you think the learning methods have significantly different results? Explain.

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Statistic Simulation Tutorial Mean score Sample std. dev Number of students x' = 9.1 s, = 2.4 ni 20 10.3 s2 = 2.5 n 20