Question 1

A university wants to study student satisfaction with campus facilities. They divide students into groups based on their year (freshman, sophomore, junior, senior) and randomly select 50 students from each group to survey. What type of sampling method is being used?

Accepted Answer

Stratified sampling

Question 2

A hospital administrator wants to survey patient satisfaction. She randomly selects 5 hospital wards and surveys every patient in those wards. Which sampling method is this?

Accepted Answer

Cluster sampling

Question 3

A researcher wants to survey every 10th person who enters a shopping mall, starting with the 3rd person. If the mall expects 500 visitors, how many people will be surveyed?

Accepted Answer

$$\frac{500 - 3}{10} + 1 = 50$$

Question 4

Which of the following best describes sampling bias?

Accepted Answer

When the sampling technique favors one part of the population over another

Question 5

A company sends out a mail-in questionnaire to all its customers, but only 10% respond. If the opinions of those who respond differ from those who do not, what type of bias is present?

Accepted Answer

Nonresponse bias

Question 6

A police department sends uniformed officers door-to-door to ask residents about their opinion of the police. Residents may not feel comfortable giving honest answers. What type of bias is most likely?

Accepted Answer

Response bias

Question 7

Which of the following statements correctly distinguishes stratified sampling from cluster sampling?

Accepted Answer

Stratified sampling divides the population into groups and samples from each group, while cluster sampling divides the population into groups and samples all individuals from randomly selected groups.

Question 8

A sales manager wants to obtain a sample of 12 clients from a list of 100 clients. He randomly selects a number from 1 to 8, obtaining the number 7. He includes the 7th client and every 8th client thereafter. What type of sampling is this?

Accepted Answer

Systematic sampling

Question 9

Which scenario is most likely to result in sampling bias?

Accepted Answer

Surveying only customers who have email addresses

Question 10

A school wants to survey students about cafeteria food. They randomly select 5 classes and survey every student in those classes. What is the main advantage of this sampling method?

Accepted Answer

It is less expensive and easier to implement than surveying all students

Question 11

Which sampling method is most appropriate when the population is naturally divided into groups and it is impractical to survey individuals from every group?

Accepted Answer

Cluster sampling

Question 12

A researcher wants to ensure that her sample includes equal numbers of men and women. She divides the population by gender and randomly selects 50 men and 50 women. What is this sampling method called?

Accepted Answer

Stratified sampling

Question 13

Which of the following is NOT a source of bias in sampling?

Accepted Answer

Random sampling bias

Question 14

A grocery store owner wants to survey every 7th customer, starting with the 5th customer. If 100 customers are to be surveyed, what is the formula for the position of the nth customer surveyed?

Accepted Answer

$$5 + 7(n-1)$$

Question 15

Which sampling method is most likely to be used when a population is very large and a list of all individuals is available?

Accepted Answer

Systematic sampling

Question 16

A survey is conducted only among people who attend a specific event. Which type of bias is most likely to occur?

Accepted Answer

Sampling bias

Question 17

If a sample is not representative of the population, what is the most likely consequence?

Accepted Answer

The results will be biased

Question 18

A researcher divides a population into groups based on income level and then randomly selects some groups to survey all individuals within those groups. What sampling method is this?

Accepted Answer

Cluster sampling

Question 19

Which of the following best describes response bias?

Accepted Answer

When survey answers do not reflect the true feelings of the respondent

Question 20

A researcher wants to study the opinions of people in a city. She divides the city into neighborhoods and randomly selects 10 neighborhoods, then surveys every resident in those neighborhoods. What is the main disadvantage of this sampling method?

Accepted Answer

It may not be representative if the selected neighborhoods are not typical of the city

Sampling Methods and Bias in Data Collection

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