Sample in Statistics

Which of the following does NOT reduce bias in sampling?

• Preventing undercoverage

• Removing leading questions on surveys

• Randomizing participants

• Giving surveys to participants that you think are representative of the population

A company wants to know the opinion of a rural community on a proposed ballot initiative. Half of the community does not have internet access, so the company sends emails to the 380 members that do have internet access. Of those surveyed, 372 of the community members responded to the survey. Which of the following is the most significant source of bias in the survey?

• Voluntary Response Bias

• Nonresponse Bias

• Undercoverage

• Response Bias

A radio station is discussing a controversial policy enacted by the local police department. They poll listeners by having them call in to the radio station. Which of the following is the most significant source of bias?

• Leading questions on the survey

• Voluntary Response Bias

• Survivorship Bias

• Self-reported response bias

Which of the following surveying methods divides individuals by a shared attribute, then randomly surveys members within each attribute-group?

• Simple random

• Stratified random

• Cluster random

• Strategic Random

Which of the following surveying methods involves randomly selecting groups of individuals, then surveys all individuals in the group?

• Stratified Random

• Cluster Random

• Simple Random

• Systematic

You are surveying members of a grocery store about their food preferences. You decide that you will survey every 4th person entering the store. What type of a survey is this?

• Convenience

• Systematic

• Snowball

• Judgement

You are surveying from a group of 35 people using a simple random sample. You assign each member of the group a number, then select 3 of them using the random digits: 61424 20419 86546 00517.

Which number is selected second?

• 42

• 4

• 20

• 19

A sportswriter wants to know how strongly Lafayette residents support the local minor league

baseball team, the Lafayette Leopards. She stands outside the stadium before a game and interviews the first

20 people who enter the stadium. The intended population for this survey is:

• all residents of Lafayette.

• all Leopard fans.

• all people attending the game the day the survey was conducted.

• the 20 people who gave the sportswriter their opinion.

• all American adults.

If we collected many different sample groups from the same population, we would expect each sample to give slightly different estimates for the population parameter due to the natural differences between the samples. This is known as:

• Simpson's Paradox

• Response bias

• Stratification

• Sampling variability

A civil engineer wants to know the opinions of drivers about online driving tests. She obtains a list of 730 drivers who have recently completed an online driving course and e-mails a questionnaire to a randomly selected group of 200 of these drivers. Only 102 of the questionnaires are returned. Identify the population and the sample in this study

• The population is 200 and the sample is 102.

• The population is 730 and the sample is 200

• The population is 102 and the sample is 730.

• The population is 730 and the sample is 102