CFA 7.1 Review

A study took random sample of 400 adults and asked them some questions about their bedtime habits. The data showed that people who drank a cup of tea before bedtime were more likely to go to sleep earlier than those who didn't drink tea.

What type of study is this?

• Experiment

• Survey

• Observational study

Tags

CCSS.HSS.IC.B.3

A group of biologist want to study the eating habits of giraffe's in the wild. They found a group of giraffes and monitor them for 6 months.

What type of study is this?

• Experiment

• Sample survey

• Observational study

Tags

CCSS.HSS.IC.B.3

A study of 1500 people was conducted where subjects were randomly assigned test a new energy drink. People were told to try the new energy drink or continue to drink their usual caffeinated beverage. They then looked at the energy levels of the participants to see if the new energy drink really did help the subjects to have more energy.

What type of study is this?

• Experiment

• Sample survey

• Observational study

Tags

CCSS.HSS.IC.B.3

A researcher is interested in how people in his neighborhood feel about the 2nd amendment. He goes to a nearby mall, a movie theater, a grocery store, and a home improvement store and asks every 6th person he sees to answer 4 short questions. What kind of study is this?

• experiment

• observation

• survey

Tags

CCSS.HSS.IC.B.3

A researcher is interested in how caffeine affects sleep. He gets 100 randomly selected 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?

• survey

• experiment

• observation

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

• Survey

Tags

CCSS.HSS.IC.B.3

A representative for Macy's walks around the mall interviewing people about their brand perception of Macy's. What kind of sample is this?

• Convenience sample

• Simple Random Sample

• voluntary response sample

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

A newspaper asks its readers to call in and answer the following question, "Are young adults unprepared for college?" What type of sample is this?

• Convenience Sample

• Simple Random Sample

• Voluntary Response Sample

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

A variable outside of what is being controlled in the experiment that has an unwanted effect on the results.

• Treatment

• Control variable

• Confounding variable

Tags

CCSS.HSS.IC.B.3

Determine if the following study is biased.

A senator wants to how she is doing. She sends a survey to 1000 registered voters in her party.

• Biased

• Unbiased

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1