CCSS.Math.Content.HSS.IC.B.3

210 college students were randomly assigned to play either a violent or nonviolent video game.  A short time later, the students were presented with the opportunity to trivially harm another person and results comparing the two groups were recorded.
Is this study OBSERVATIONAL or EXPERIMENTAL? 

• Observational
• Experimental

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CCSS.Math.Content.HSS.IC.B.3

Identify the Population:
Members of the Drama Club plan to sell popcorn as a fundraiser for their Shakespeare production. They survey 75 students at random about their favorite flavors of popcorn. 33 students like butter, 15 like cheese, and 27 like caramel.

• 33 Students
• 75 Students
• All Students
• 27 Students

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CCSS.Math.Content.HSS.IC.B.3

The process of collecting information/data from the sample.

• Census
• Interview
• Survey
• Questionnaire

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CCSS.Math.Content.HSS.IC.B.3

Sampling method that in which the population is divided into HOMOGENEOUS groups and SRS’s are pulled from each group.

• Stratified Sampling
• Simple Random Sampling (SRS)
• Cluster Sampling
• Systematic Sampling

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CCSS.Math.Content.HSS.IC.B.3

Source of bias that occurs when you ask people who are EASY to ask

• Response Bias
• Convenience Sampling
• Nonresponse
• Voluntary Response

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CCSS.Math.Content.HSS.IC.B.3

Marianne wanted to know students' opinion on the new schedule at school. She places students' names in a container and randomly picks out 20 names. 

• Convenience Sampling
• Systematic Sampling
• Random Sampling
• Volunteer response

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CCSS.Math.Content.HSS.IC.B.3

Cluster, stratified, simple random, systematic, and proportional are all types of 

• convenience samples
• biased samples
• haphazard samples
• unbiased samples

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CCSS.Math.Content.HSS.IC.B.3

Identify the sampling design: Mr. Rhoades asks Mr. May, his neighbor, who his favorite America's Got Talent contestant is

• cluster
• unbiased
• stratified
• convenience

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CCSS.Math.Content.HSS.IC.B.3

A report in a medical journal notes that the risk of developing Alzheimer's disease among subjects who regularly opted to take Ibuprofen was about half the risk among those who did not.  Is this good evidence that Ibuprofen is effective in preventing Alzheimer's?

• Yes, because the study was a randomized, comparative experiment
• No, because the effect of Ibuprofen is confounded with the placebo effect
• No, because this is an observational study.  An experiment would be needed to confirm (or not confirm) the observed effect.
• Yes, because a 50% reduction can't hapen just by chance

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CCSS.Math.Content.HSS.IC.B.3

Runners after an ultramarathon commonly develop respiratory infections. We want to know if taking 600 milligrams of vitamin C daily will reduce these infections. Researchers randomly assigned 100 ultramarathon runners to receive either vitamin C or placebo. All subjects were watched for 14 days after the big race to see if infections developed. What are the possible lurking variables?

• Age of the runner
• weight of the runner
• gender of the runner
• all of the above

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CCSS.Math.Content.HSS.IC.B.3