Question

A medical researcher wants to determine whether exercising can lower blood pressure. At a health fair, he measures the blood pressure of 100 individuals, and interviews them about their exercise habits. He divides the individuals into two categories: those whose typical level of exercise is low, and those whose level of exercise is high.
Required:
a. Is this a controlled experiment or an observational study?
b. The subjects in the low exercise group had considerably higher blood pressure, on the average, than subjects in the high exercise group. The researcher concludes that exercise decreases blood pressure. Is this conclusion well-justified? Explain.

Answer 1

This is an observational study and the conclusion of the researcher is not justified.

Controlled experiment

A controlled experiment is such that all the other factors in the experiment are kept the same except the variable that is being studied. This study is not a controlled experiment is not a controlled experiment because other factors that could affect the study were not carefully controlled.

This is an observational study. The conclusion of the researcher is not justified because other factors such as diet which could affect the blood pressure were not taken into account.

Learn more about controlled experiment: brainly.com/question/4444046