Unit 3 Quiz 2 (AP Stats)

This sample consists of the entire population

• convenience
• census
• cluster
• simple

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

The conductor has no input or control over the environment in this situation

• census
• observational study
• experiment
• judgment

Tags

CCSS.HSS.IC.B.3

The conductor has control over the environment in this setting

• experiment
• observational study
• population
• sample

Tags

CCSS.HSS.IC.B.3

Researchers were interested to know whether internal vehicle temperatures vary by outside temperatures. To evaluate this, temperature rise was measured continuously over a 60-minute period in a dark SUV on 16 different clear, sunny days with outside temperatures ranging from 72^oF to 96^oF. The researchers' method of analysis is best described as:

• a census.

• a survey.

• an observational study.

• a randomized comparative experiment.

• a single-blind randomized comparative experiment.

Tags

CCSS.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. The type of design used here?

• matched pairs
• randomized block
• completely randomized
• stratified 

Tags

CCSS.HSS.IC.B.3

The most important advantage of experiments over observational studies is that

• A) experiments are usually easier to carry out
• B)Experiments can usually give better evidence of causation
• C) Confounding cannot happen in experiments
• D) Observational studies cannot use random samples

Tags

CCSS.HSS.IC.B.3

In order to perform an experiment using 60 members of a gym, I first divide the list of members into men and women because I feel that the results will be different based on gender. I then randomly choose 30 men and 30 women. I assign half of the men to the treatment group and half to the control group. I repeat this procedure with the women. This is an example of a:

• randomized comparative design
• blocking design
• matched pairs design
• double blind simple random sample

Tags

CCSS.HSS.IC.B.3

A market research company wishes to find out whether the population of students at a university prefers Starbucks or Dunkin Donuts. A random sample of students is selected, and each student is asked first to try both but the order they try them is randomly decided with a coin toss (heads: Starbucks, then Dunkin. tails: vice versa). They then indicate which brand they prefer. This is an example of

• a completely randomized experiment
• an observational study
• a stratified sample
• a matched pairs experiment

Tags

CCSS.HSS.IC.B.3

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

Tags

CCSS.HSS.IC.B.3

A researcher randomly selected 30 people to participate in a study to investigate which of two materials, A or B, used in the heels of sneakers will last longer. The researcher is considering two design types for the study.

Design 1: Randomly assign 15 participants to wear sneakers with material A on their left feet and material B on their right feet. The remaining participants will wear sneakers with material B on their left feet and material A on their right feet.

Design 2: Randomly assign 15 participants to wear sneakers with material A on both feet and the remaining participants to wear sneakers with material B on both feet.

Which of the following best describes each design?

• Design 1 is a completely randomized design, and design 2 is a matched pairs design.

• Design 1 is a matched pairs design, and design 2 is a completely randomized design.

• Design 1 is a matched pairs design, and design 2 is a matched pairs design.

• Design 1 is a completely randomized design, and design 2 is a completely randomized design.

• Design 1 is a completely randomized design, and design 2 is a randomized block with materials as blocks.

Tags

CCSS.HSS.IC.B.3