Relationship between caffeine and blood pressure

Reference no: EM131816695

Researchers monitored the food and drink intake of 159 healthy black and white adolescents aged 15 to 19. "They found that those who drank the most caffeine-more than 100 milligrams a day, or the equivalent of about four 12-ounce cans, had the highest pressure readings."4 Weight was acknowledged as a possible confounding variable-one whose values are tied in with those of the explanatory variable, and also has an impact on the response.

a. Based on your experience, do people who consume a lot of soft drinks tend to weigh more or less than those who do not?

b. Based on your experience, do people who weigh a lot tend to have higher or lower blood pressures?

c. Explain how consumption of soft drinks could be a confounding variable in the relationship between caffeine and blood pressure.

d. If weight is a possible confounding variable, should adolescents of all weights be studied together, or should they be separated out according to weight?

e. Was this an observational study or an experiment?

Reference no: EM131816695

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