AP Stats Unit 3 Review

If we wish to compare the average PSAT scores of boys and girls taking AP Stats at this school, which would be the best way to gather these data?

• Census
• SRS
• Stratified Sample
• Observational Study

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.4

A factory has 20 assembly lines producing a popular toy. To inspect a representative sample of 100 toys, quality control staff randomly selected 5 toys from each line's output. Was this a SRS?

• Yes, because toys were selected at random
• Yes, because each toy produced an equal chance to be selected
• No, because not all combinations of 100 toys could have been chosen
• No, because toys do not come off the assembly line at random

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CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.4

Which is true about sampling? 
1: An attempt to take a census will always result in less bias than sampling
2. sampling error is usually reduced when the sample size is larger
3. Sampling error is the result  of random variations and is always present

• 2 only
• 3 only
• 2 and 3
• All Three

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CCSS.HSS.IC.B.4

Does regular exercise decrease the risk of cancer? A researcher finds 200 women over 50 who exercise regularly, pairs each with a woman who has a similar medical history but does not exercise, then follows the subjects for 10 yrs to see which group develops more cancer. This is a :

• survey
• retrospective study
• prospective study
• matched experiment

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CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.5

Which is important in designing a good experiment?
1. Randomization in assigning subjects to treatments
2. Control of potentially confounding variablese
3. Replication of the experiment on a sufficient number of subjects

• 1 and 2
• 1 and 3
• 2 and 3
• All 3

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CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.5

Which is important in designing a good experiment?
1. Randomization in assigning subjects to treatments
2. Control of potentially confounding variablese
3. Replication of the experiment on a sufficient number of subjects

• 1 and 2
• 1 and 3
• 2 and 3
• All 3

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.5

Researchers have 50 volunteers check their pulse rates. Then they watch an action film, after which they check their pulse rates once more to determine if there is a change due to the movie. Which aspect of experimentation is present in this research?

• blinding
• randomization
• a control group
• none of these

Tags

CCSS.HSS.IC.B.5

In an experiment the primary purpose of blocking is to reduce

• bias
• confounding
• variation
• undercoverage

Tags

CCSS.HSS.IC.B.5