Student Performance across Discussion Sections

 Student performance across discussion sections. A professor who teaches a large introductory statistics class (197 students) with eight discussion sections would like to test if student performance differs by discussion section, where each discussion section has a different teaching assistant. The summary table below shows the average final exam score for each discussion section as well as the standard deviation of scores and the number of students in each section.

Sec 1 Sec 2 Sec 3 Sec 4 Sec 5 Sec 6 Sec 7 Sec 8

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ni 33 19 10 29 33 10 32 31 x̄i 92.94 91.11 91.80 92.45 89.30 88.30 90.12 93.35 si 4.21 5.58 3.43 5.92 9.32 7.27 6.93 4.57

The ANOVA output below can be used to test for differences between the average scores from the different discussion sections.

Df Sum Sq Mean Sq F value Pr(>F)

section 7 525.01 75.00 1.87 0.0767 Residuals 189 7584.11 40.13

Conduct a hypothesis test to determine if these data provide convincing evidence that the average score varies across some (or all) groups. Check conditions and describe any assumptions you must make to proceed with the test.

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