Unit 3, Quiz #2

What is the difference between an observational study and an experiment?

• Observational studies compare data.

• Experiments involve imposing a treatment.

• Observational studies have subjects and treatments.

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CCSS.HSS.IC.B.3

Jane Goodall lived among wild chimpanzees intermittently for decades, studying their social and family systems while keeping her interaction with the chimpanzees to a minimum. Her research method can most accurately be described as a...

• survey

• case study

• experiment

• observation

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
• Neither
• Both observational study and experiment

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CCSS.HSS.IC.B.3

Identify each of the following as an observational study or an experiment.

Compare the grades on a final math test of 25 students who were given a calculator to use and 25 students who do not use calculators.

• Observational Study

• Experiment

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CCSS.HSS.IC.B.3

All 200 fifth grades at a school are randomly assigned to one of two groups. One group studies addition of fractions with the aid of a calculator, the other studies the same topic without a calculator. Scores on a fractions test are compared after two weeks.

• Observational Study

• Experiment

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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

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

The smaller group of the population that is selected to take the survey

• Population

• Sample

• Instrument

• Outcome

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1