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A recent clinical study demonstrated a possible connection between coffee consumption and heart health. The

researchers performed a 6-week trial with 191 individuals, all of whom were heavy coffee drinkers (average of 5 cups/day) prior to the experiment, but none of whom were smokers. They divided the 191 participants into three groups: no coffee consumption, 1-3 cups/day, and 4 or more cups/day. They measured blood levels of cholesterol and homocysteine as indicators of heart health. Only the no-coffee group showed a significant drop in both indicators. Previous studies had demonstrated that decreases of the magnitude observed in the no-coffee group could cut the incidence of heart disease by 10-15%. 

  •     What is the experimental variable?
  •   List the controls.
  •   What is being measured to test the hypothesis?


 

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The experimental variable is heart health. The controls include: heavy... View the full answer

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