Question 1

Which of the following best describes a simple random sample (SRS)?

Accepted Answer

A sample in which every member of the population has an equal chance of being selected.

Question 2

A supermarket offers free salsa samples and asks for opinions. What type of sampling is this?

Accepted Answer

Convenience sampling

Question 3

Which of the following scenarios is most likely to result in a biased sample?

Accepted Answer

Surveying only the men’s basketball team to estimate the mean height of all students.

Question 4

In cluster sampling, which of the following steps is correct?

Accepted Answer

Randomly select groups (clusters), then include all members of those groups in the sample.

Question 5

A researcher wants to estimate the average price of gasoline near airports. She randomly selects several airports and checks every gas station within a mile of each. What sampling method is this?

Accepted Answer

Cluster sampling

Question 6

Which of the following is an example of stratified sampling?

Accepted Answer

Dividing the population into geographic areas and randomly selecting individuals from each area.

Question 7

If a study’s design or conduct tends to favor certain results, the study suffers from:

Accepted Answer

Bias

Question 8

Which sampling method is most likely to yield a representative sample of all adults in Alaska regarding robocalls received?

Accepted Answer

Randomly selecting phone numbers from a list of all phone numbers in Alaska.

Question 9

A quality control manager selects every 100th chicken breast off the line for testing. What sampling method is this?

Accepted Answer

Systematic sampling

Question 10

Which of the following statements about sampling is TRUE?

Accepted Answer

A well-chosen sampling method may still be unrepresentative due to random chance.

Question 11

Suppose you want to estimate the proportion of eligible voters in California likely to vote for a candidate. Which method is most likely to yield a representative sample?

Accepted Answer

Selecting every 1000th person on a complete list of all eligible voters in California.

Question 12

Which of the following is NOT a way bias can occur in a statistical study?

Accepted Answer

Randomly selecting individuals from the entire population.

Question 13

A computer program randomly selects ticket numbers of 11 attendees to win autographed footballs. What sampling method is this?

Accepted Answer

Simple random sampling

Question 14

Which sampling method involves selecting every nth member from a population?

Accepted Answer

Systematic sampling

Question 15

Which of the following best describes a representative sample?

Accepted Answer

A sample in which the relevant characteristics of the sample members are generally the same as those of the population.

Question 16

Which of the following is a potential problem with systematic sampling in a co-ed dorm where males are in odd-numbered rooms and females in even-numbered rooms, if you select every 10th room?

Accepted Answer

You may end up with a sample containing only males or only females.

Question 17

Which of the following is an example of convenience sampling?

Accepted Answer

Surveying people who are walking their dogs outside your apartment building.

Question 18

Which sampling method is used when the population is divided into strata and individuals are randomly selected from each stratum?

Accepted Answer

Stratified sampling

Question 19

Which of the following best describes the difference between cluster and stratified sampling?

Accepted Answer

Cluster sampling selects all members from randomly chosen groups, while stratified sampling selects some members from all groups.

Question 20

Which of the following is a key requirement for a sample to be considered a simple random sample?

Accepted Answer

Every possible sample of a particular size has an equal chance of being selected.

Sampling Methods in Statistics: Section 1.2 Study Guide

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