Question

Scientists developed a new margarine containing plant ingredients they think will lower blood cholesterol levels in people who use the margarine. They want to test this by comparing the cholesterol levels of people who use the new margarine for a while to cholesterol levels of a group of people who use regular margarine. This is an example of what type of research design?

Answer 1

Explanation:

A person with heart disease is told he has to make some changes in his diet and lifestyle practices. He states, "I know that I should make changes because my father and brother both died of heart attacks. But I really like to have my big steaks for dinner.