Types of Studies and Sampling Methods

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.

• Observational Study

• Experiment

Tags

CCSS.HSS.IC.B.3

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.

• Observational Study

• Experiment

Tags

CCSS.HSS.IC.B.3

A professor finds that people who are obese have higher cholesterol levels than those who are not obese.

• Observational Study

• Experiment

Tags

CCSS.HSS.IC.B.3

You want to see if students who have a 4.0 grade point average study more than those who do not.

• experiment

• observational study

Tags

CCSS.HSS.IC.B.3

You want to compare the health of students who walk to school to the health of students who ride the bus

• experiment

• observational study

Tags

CCSS.HSS.IC.B.3

To test the effects of breakfast on grades I ask my students if they ate breakfast and then compare the breakfast eaters grades to the non-breakfast eaters.

This is an example of:

• Observational study

• Experiment

Tags

CCSS.HSS.IC.B.3

Rats with cancer are divided into two groups. One group receives 5 milligrams of a medication that is thought to fight cancer and the other receives 10 mg. After 2 years, the spread of cancer is measured.

• Observational Study

• Experiment

Tags

CCSS.HSS.IC.B.3

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

• Observational Study

• Experiment

Tags

CCSS.HSS.IC.B.3

A researcher is interested in learning how people use the neighborhood park. The researcher goes to the park daily for a month and records how many people are on the playground, how many are on the basketball court, how many are at the picnic tables, and how many are at the skate park. What type of study is this?

• Observational

• Experiment

Tags

CCSS.HSS.IC.B.3

A researcher is interested in how caffeine affects sleep. He has 100 people spend the night in the lab. Before bed, he gives 50 people decaffeinated coffee and 50 people caffeinated coffee. He records the brain waves of each participant throughout the night. What kind of study is this?

• observational study

• experiment

Tags

CCSS.HSS.IC.B.3