Ch 12 Practice

One group of subjects was given an herbal supplement and another group was given a placebo. After one year, the number of illnesses each group had was compared.

A researcher stood at a school parking lot entrance to see if the color of a car is related to the driver not wearing a seatbelt.

Four groups of randomly selected people are assigned a different diet. After six months, the blood pressures of each group are compared.

A psychologist designed a study to test the effects of cell phone use on driving safety. Participants were randomly assigned either to drive an automobile simulator while talking to a friend on a cell phone or to drive a simulator without talking on a phone.

Which type of research does the scenario describe?

Researchers wanted to know if there is a link between proximity to high-tension wires and the rate of leukemia in children. To conduct the study, researchers compared the rate of leukemia for children who lived within 1/2 mile of high-tension wires to the rate of leukemia for children who did not live within 1/2 mile of high-tension wires.

In a survey of a sample of high school students, 43% said that their mother has taught them the most about managing money.

A poll is taken from 100 seniors in a high school where the senior class has 575 students. This is an example of a ______________.

Joe Mama wants to do an observational study comparing height and weight. He also does a study comparing weight and calories consumed daily. He concludes that the more calories you consume, the more you weigh. And people who weigh more are generally taller. Therefore, if you eat more, you will get taller. Why is this incorrect?

Which is one of the main differences between experiments and observational studies?