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sam wants to know how effective p90x is at weight loss, relative to A control group. Consequently he goes to a local gym and measures
sam wants to know how effective p90x is at weight loss, relative to A control group. Consequently he goes to a local gym and measures the bmi of participants in several p90x classes (293 people total) He then collects the sam data from 293 couch potatoes. He concludes p90x is effective at increasing weight loss.
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