Unit 3 Review: Surveys & Experiments

Dylan wants to know how the students at his school rate the cafeteria. He surveyed his school's basketball team to rate the school cafeteria. Is this a biased sample of the school's population?

• Yes, because it is a convenience survey

• No, the basketball team is representative of the population

• Yes, because it's voluntary survey

• No, because it is a SRS

In order to assess the effects of exercise on reducing cholesterol, a researcher sampled 50 people from a local gym who exercised regularly and 50 people from the surrounding community who did not exercise regularly. They each reported to a clinic to have their cholesterol measured. The subjects were unaware of the purpose of the study, and the technician measuring the cholesterol was not aware of whether subjects exercised regularly or not. This is

• an observational study
• an experiment

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

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.5

One day, Ms. Senneseth wants to estimate how many students did their HW. She draws from her card deck and gets a "1" and a "5". She then asks all the students at Table 1 and all the students at Table 5. This sampling technique is called?

• Simple Random Sample

• Stratified

• Systematic

• Cluster

What is the response variable in this experiment?

"Does eating breakfast improve test score?"

• eating breakfast or not

• the grade you got on the test

• what time you get up in the morning

• what you eat for breakfast

What is the explanatory variable in this experiment?

"Which type of metal, copper or aluminum, conducts heat faster?"

• size of metal

• types of metal

• time it takes to heat up

• shape of the metal

Identify the sampling technique: Interview every 10th student who enters the school in the morning.

• simple random

• voluntary response

• systematic

• convenience

Identify the sampling method: Assign each car in a dealership a number and then use a random-number table to select the cars to be inspected.

• systematic

• simple random sample

• convenience

• cluster

An independent research company wants to go door to door to survey people in the town of Fort Mill. The company decides to number all neighborhoods within the town limit, randomly chooses 5 neighborhoods, and then surveys all households in those neighborhoods.

This is an example of:

• Simple Random Sample

• Stratified Random Sample

• Cluster Random Sample

• Systematic Random Sampling

A ___ is a large group that includes everything of interest being studied.

• Sample

• Simple random sample

• Population

• individual