Other Sampling Methods

Which statement about stratified random sampling is true?

A stratified random sample is a combination of simple random samples selected from each of several strata

Which of the statements is NOT true regarding the advantages and disadvantages of systematic random sampling?

One disadvantage is that it cannot be used if you do not have a list of every member of the population.

Which of the statements is NOT true regarding the advantages and disadvantages of stratified random sampling?

One advantage is that it makes the process of selecting a sample easier when the population is very large.

A school district has eight elementary schools, four middle schools, and two high schools. The district's IT manager wishes to survey teachers regarding the use of technology in the classroom. Which of the following designs would create appropriate strata?

Four teachers from each school in the district are chosen at random to complete a survey on the topic.

Which statement(s) apply to stratified random sampling? Check all that apply.

It can provide better estimates than a simple random sample. The researcher needs some knowledge of the population in terms of characteristics relevant to the study. Creating strata of similar individuals to sample from reduces variability. It can be difficult to obtain with a very large population. So A,B,D,E

Which statement(s) are accurate about cluster sampling? Check all that apply.

It is convenient because groups of individuals located near each other are sampled. It is a more cost-effective and less time-consuming way of sampling. Forming representative clusters can be challenging.

Which is the best example of selecting a systematic random sample?

Members of a population are listed in order of birthday, and every 5th person is selected until a sample of 100 people is formed.

Which best describes the process of selecting a cluster sample?

Members of a population are organized in clusters, each of which is representative of the population, and then whole clusters are randomly selected to make up the sample.

Scenario A:A school has 500 students, 300 of whom are male. A teacher wants to survey 20 students, so he selects 12 male students by randomly drawing names from a bowl. He uses the same method to select 8 female students. Scenario B:Coach Swann wants to select 2 of his 47 team members to ride on the float in a parade. He assigns a number to each player, then draws two numbers between 1-47 out of a hat. The members assigned the numbers drawn will ride on the float. Read each scenario. Check all statements that are true.

Scenario A is an example of stratified random sampling. Scenario B is an example of a simple random sample. So B,C

Select the sampling type for each scenario. Scenario A: Starting with a randomly selected student, a cafeteria staff member surveys every 15th student in the line about their favorite menu option. Scenario B: Mr. Kent assigns a number to each of his students and randomly draws two numbers. Those students will represent the school at an event. Scenario C: A regional manager wants to know which benefit package her employees favor, so she randomly polls 10 employees from each of the 14 stores in her region.

Scenario A is an example of systematic random sampling. Scenario B is an example of simple random sampling Scenario C is an example of stratified random sampling.

Scenario A: A coach assigns a number to each one of his players and randomly draws three numbers. The students to whom those numbers are assigned will represent the team on the stage at the pep rally. This is an example of Scenario B: A store representative surveys every 10th customer entering the store about store hours. This is an example of Scenario C: The manager of a condominium complex wants owners' opinions regarding whether to add a fitness room or add a hot tub to the property. Rather than ask the owner of every unit, he surveys all the owners from the 6th and 15th floors. This is an example of Scenario D: The administration of a high school wants to know whether students prefer regular or block schedules. They randomly select 30 students to survey from each grade. This is an example of

Simple random sampling, systematic random sampling, cluster sampling, stratified random sampling

Researchers conducted a study on the effects of practice time of athletes on their endurance. To form the sample, researchers grouped the population by sport and then randomly selected 25 athletes from each group. Which statement identifies the sampling procedure used and gives a valid reason?

Stratified random sampling: subjects were randomly selected from each sport.

Which statement(s) give advantages or disadvantages of systematic random sampling? Check all that apply.

The population size does not need to be known. Unknown patterns of differences in the population can be difficult to detect. Every member of a population does not need to be known.

Researchers conducted a study on the effects of recess on elementary-student learning. To form the sample, researchers randomly selected elementary schools from across the country and included all students at each selected school. For the sampling procedure in this study, the researchers used

cluster sampling

The management of an indoor shopping mall wants to survey its shoppers about the layout of the stores in the mall. One day, they randomly select one store from each of the differently colored sections of the mall. They select the stores numbered 2, 8, 28, and 40, and survey all of the shoppers in each store. This scenario describes

cluster sampling

A bunch is a group of individuals in the population who are located near each other. The individuals in a cluster are , whereas the individuals in a strata are

cluster, heterogenous, homogenous

The management of an indoor shopping mall wants to survey its shoppers about the layout of the stores in the mall. Raffle tickets are handed out at each entrance. Ninety-six of the raffle tickets were randomly selected ahead of time and marked. Customers who receive the marked tickets are to be surveyed. This scenario describes

simple random sampling

The management of an indoor shopping mall wants to survey its shoppers about the layout of the stores in the mall. At a specified time one day, they send a team of interviewers to survey 2 randomly selected customers in each of the 48 stores in the mall. This scenario describes

stratified random sampling

Researchers conducted a study on the effects of exercise on mood. To form the sample, researchers went to a public mall and randomly selected a person who walked by to survey, and then they surveyed every 5th person after that until they had a sample of 30 people. For the sampling procedure in this study, the researchers used

systematic random sampling

The management of an indoor shopping mall wants to survey its shoppers about the layout of the stores in the mall. They begin by surveying a random person who enters the mall, then survey every 4th person who enters until they have surveyed 100 people. This scenario describes

systematic random sampling