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SCI1020 - Introduction to Statistical Reasoning - S2 2026
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A study investigates the impact of two independent variables on student test scores: study environment (Quiet Room vs. Background Music) and study duration (1 hour vs. 3 hours). Participants are randomly assigned to one of the possible treatment combinations. Which experimental design is this?
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A medical trial is testing a new hypertension drug. Because age is known to affect blood pressure, participants are first grouped into three age brackets: Under 30, 30–50, and Over 50. Within each age group, participants are randomly assigned to either the drug or a placebo. Which design does this describe?
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An ergonomics expert measures participants' typing speed on three different keyboard layouts (Layout A, Layout B, Layout C). Every participant tests all three keyboards, with a resting period in between each trial. Which experimental design is being used?
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Which statement best describes a sample?
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