Statistical Questions and Random Sampling

A school principal wants to offer an after-school club setting. She decided to survey 300 students about this. Which word best describes the group of 300 students?

• Population

• Sample

• Census

• Prediction

What is the main purpose for asking statistical questions?

• Surveying people is fun.

• We can create charts with statistics.

• Statistical questions help us gather data about a topic.

Surveyors in a mall randomly selected shoppers to ask about products they prefer. What would be the population in this example?

• the surveyors

• all shoppers in the mall

• the shoppers who were asked their preferences

Before a nation wide election, a polling place was trying to see who would win. Which choice best represents a sample?

• A selection of voters over age 50.

• A selection of male voters.

• A selection of voters of different ages.

• All of these.

Determine whether it would be feasible to survey the population or a sample:

You want to know the number of students in Florida who have summer jobs.

• Survey the population

• Survey a sample

Determine if the following is a valid statistical question. Justify your answer.

How much money do high-school students carry with them?

• statistical question

• not a statistical question

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

• Self - selected (volunteer)

Which is an example of a random sample?

• Polling the first 10 people who enter a room

• Asking a survey question to people who call in

• Drawing 10 names from a hat

Volunteers for a politician's campaign called 100 randomly selected citizens to conduct a survey. Only 50 people agreed to answer the survey questions, and most of them were supporters of the candidate. This is an example of...

• Voluntary Response Bias

• Nonresponse Bias

• Undercoverage Bias

Which of the following would reduce the variability in sampling?

• Using a larger sample size

• Using a smaller sample size

• Assigning individuals randomly

• Using Judgement Sampling