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Do SAT coaching classes work? Do they help students to improve their test score...
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Do SAT coaching classes work? Do they help students to improve their test scores? In a study, eight students took a SAT exam a second time. Four of these students took an SAT coaching class. The other four students did not. The improvements in test scores over the first exam were recorded for each group.
Improvement |
1 | 2 | 3 | 4 | |
Coaching class | 90 | 100 | –30 | 40 |
No coaching class | 10 | 80 | 70 | –20 |
To analyse this data, we should use
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