Nov 8 AP Stats Warm Up

For a school project, three students need to produce a sample of students at their school. Which of the following methods leads to a random sample?

• Numbering all the students and produce the sample from a random list of numbers

• Calling for volunteers at the school assembly

• Calling for volunteers via social media

• Asking each of their friends to name three further friend2

At a local golf club, there are 50 male members and 30 female members. A representative sample of 10 random male members and 6 random female members is chosen. Which of the following is the sampling method used?

• simple random sampling

• systematic random sampling

• stratified sampling

Poole wants to know how students at OV rate the school lunch. I surveyed my AP Psych class to rate the food. Is this a biased sample of the school's population?

• Yes because it is a convenience sample. The sample is asking a very specific group that may not accurately match the population.

• No, the AP Psych class has the smartest students and the best taste.

• Yes, because it is a voluntary survey that only interested students took.

• No, Poole should have asked the culinary class since have more experience with food.

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

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.