AP Statistics - 3.4 Experiments - Scenario 1 - 10

Read scenario 1.

Can we conclude that the fast-paced music caused her classmates to finish the maze faster? Why?

• Yes, because the study included each student in her class.

• Yes, because the students were randomly selected.

• Yes, because the students were randomly assigned to treatment and control.

• Not necessarily, because the sample size is too small.

• Not necessarily, because this wasn't an experiment.

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.5

Read scenario 2.

What conclusion can they draw from this study?

• Having sleep problems caused the women to have higher blood pressure.

• Higher blood pressure caused the women to have sleep problems.

• Any women in this study with sleep problems also has high blood pressure.

• For any two women in this study, the one who has more sleep problems has higher blood pressure.

• There was an association between sleep problems and high blood pressure, but it's not necessarily a causal relationship.

Tags

CCSS.HSS.ID.B.6

CCSS.HSS.ID.C.9

Read scenario 3.

What type of experiment design is this?

• A matched pairs design with rock and country music as the pairs.

• A randomized block design where the 3 ecosystems are the blocks.

• A stratified random design.

• A random block design where the 3 sound types are the blocks.

• A completely randomized experiment design.

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.5

Read scenario 4.

Which of these concerns makes their conclusion inappropriate?

• The students weren't blocked based on previous test scores.

• No blinding was used on the students or the researchers.

• This wasn't a random sample of students.

• Some of the 50 students should have been assigned to a control group that used in the in-person course.

• Some of the 50 students should have been assigned to a control group that received no tutoring.

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.5

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.4

Read scenario 5.

Which of the following strategies is most appropriate for accomplishing this?

• Block on dog breed and randomly assign puppies to existing and new formula groups within each breed.

• Block on geographic location and randomly assign puppies within each breed. Then assign puppies by breed to either the existing or the new formula.

• Stratify on dog breed and randomly sample puppies within each breed. Then assign puppies by breed to either the existing or the new formula.

• Stratify on geographic location of the puppies and randomly sample puppies within each geographical region. Then assign puppies by geographic area to either the existing or new formula.

• Stratify on gender and randomly sample puppies within gender groups. Then assign puppies by gender to either the existing or the new formula.

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.A.1

Read scenario 6.

Which of the following best describes why a completely randomized design is an appropriate design to use in this situation?

• 1. There is no blocking variable, and incentive plans will be randomly assigned to the workers.

• 1. There is no blocking variable, and the workers were selected at random.

• 1. Each incentive plan is a block, and a completely randomized design is not blocked.

• 1. Each plan will be randomly assigned to 10 pairs of workers who share a similar characteristic.

• 1. The number of workers participating in the study was greater than or equal to 30.

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.5

Read scenario 7.

Which of the following is potentially a confounding variable in this study?

• 1. Chemical used

• 1. Lab technician

• Dose

• 1. Cell type

• 1. Cell growth

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.5

Read scenario 8.

What can be concluded from the experiment?

• 1. There is not enough evidence to attribute the higher ratings to the new paint.

• 1. The new paint will last longer than the old paint if used on wooden surfaces.

• 1. The experiment is inconclusive because blocks from only one type of wood were used.

• 1. The experiment is inconclusive because one month is not enough time for paint to weather.

• 1. Because the blocks were randomly assigned to the type of paint, there is evidence that the new paint

  causes better ratings than the old paint.

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.5

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.6

Read scenario 9.

Which of the following describes the best design to use for the study?

• A completely randomized design. Randomly assign the nine combinations of price level and packaging type so that three stores use each combination.

• A completely randomized design. Randomly assign the three price levels so that nine stores use each

  price level.

• A completely randomized design. Randomly assign the three packaging types so that nine stores use

  each type of packaging.

• A randomized block design. Use packaging as a block. Randomly assign the nine combinations of three

  price levels and three packaging types so that three stores use each combination.

• A randomized block design. Use packaging as a block. Randomly assign nine stores to each packaging type, then randomly assign price level to three stores within each

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.5

Read scenario 10.

Which of the following designs would be best to use in the study?

• A completely randomized design. Randomly assign ten lambs to the GM diet and ten lambs to the nGM diet.

• A stratified randomized design. Divide the lambs into males and females. Within each group, randomly

  assign the GM diet to one half and the nGM diet to the other half.

• 1. A randomized block design. Randomly assign ten lambs to the GM diet and ten lambs to the nGM
     diet.

• 1. A randomized block design. Randomly assign the GM diet to the male lambs and the nGM diet to the female lambs.

• A matched pairs design. For each set of twins, randomly assign one twin to the GM diet and the other twin to the nGM diet.

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.5