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Exhibit 10-3 A statistics teacher wants to see if there is any difference in the abilities of students enrolled in statistics today and those enrolled five years ago. Final examination scores from a random sample of students enrolled today and from a random sample of students enrolled five years ago were selected. You are given the following information. Today Five Years Ago 82 88 σ2 112.5 54 n 45 36 Refer to Exhibit 10-3. The standard error of is _____.
Options
A.4
B.9.3
C.12.9
D.2
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To assess whether there is a difference in mean scores between today’s statistics students and those from five years ago, we compare the sampling distributions of the two sample means. The standard error of the difference between two independent means is given by SE(x̄_today − x̄_past) = sqrt( (σ_today^2 / n_today) + (......Login to view full explanationLog in for full answers
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