CCSS.Math.Content.HSS.IC.B.5

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.5

What does it mean when a test is statistically significant?

• it has reached alpha level status
• the test statistic had a P-value higher than the alpha level
• the test statistic had a P-value lower than the alpha level
• it is important in practical terms

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CCSS.Math.Content.HSS.IC.B.5

Identify the design  for the experiment

• completely randomized, the factor is pesticide
• randomized block, blocked on tree type, the factor is pesticide
• This experiment is single blind, blocked by pesticide
• The experiment is double blind, the factors are tree type and pesticide

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CCSS.Math.Content.HSS.IC.B.5

To ensure that the experiment results are valid it is important that the experiment be...

• Replicated
• Controlled
• Randomized
• All of the above

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CCSS.Math.Content.HSS.IC.B.5

Assigning treatment groups by dividing participants into blocks of subjects with similar characteristics and then within each block you randomly assign subjects to treatment groups

• Randomized Block Design
• Matched Pairs Design
• Random Selection

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CCSS.Math.Content.HSS.IC.B.5

Choosing people at random at the supermarket and asking them to taste two brands of orange juice to determine which brand they prefer.

• Census
• Sample Survey
• Experiment
• Observational Study

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CCSS.Math.Content.HSS.IC.B.5

Determine if people who take vitamin C every day are less likely to get colds.

• Cencus

• Sample Survey

• Experiment

• Observational Study

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CCSS.Math.Content.HSS.IC.B.5

To investigate whether standing up while studying affects performance in an algebra class, a teacher assigns half of the 30 students in his class to stand up while studying and assigns the other half to not stand up while studying. Which of the following best describes this plan?

• This is an observational study

• This is an experiment

• This is a stratified random sample

• This is a cluster sample

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CCSS.Math.Content.HSS.IC.B.5

You want to see if fifth-grade boys or fifth-grade girls are faster at solving jigsaw puzzles. You randomly select twenty fifth-grade boys and twenty fifth-grade girls from fifth graders in your school district. You time and record how long it takes each student to solve the same jigsaw puzzle correctly.

What type of study is described?

• Survey

• Experimental Study

• Observational Study

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CCSS.Math.Content.HSS.IC.B.5

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

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CCSS.Math.Content.HSS.IC.B.5