ee consumption and heart health. The researchers performed a 6-week trial with 1
ID: 134487 • Letter: E
Question
ee 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 ex periment, 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%. a) What is the problem/question being studied? b) What is the hypothesis? c) What is the experimental variable? d) List the controls. e) What is being measured to test the hypothesis?Explanation / Answer
A) The question being studied over here is the association of coffee i.e caffeine consumption with heart disease. This is being evaluated by the blood cholesterol and homocysteine level. The problem is that of how to decrease heart disease.
B) Chances of heart disease increases with the consumption of caffeine. This is the hypothesis.
C) Experimental variable are those variable whose values are independent of changes in the values of other variables. So, blood of the people having 1-3 cups of coffee and those having more than four cups of coffee are the experimental variables
D) The blood of the people inthe no coffee group are the control.
E) The blood cholesterol and homocysteine levels, are measured in these experiments. Cholesterol is a lipid and homocysteine is an amino acid but both of these are unhealthy for heart.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.