Basics of Sampling
What is the process of selecting a small number of elements from a larger defined target group to make judgments about the larger group?
Sampling
What type of error is attributable to mistakes in either drawing a sample or determining the sample size?
Sampling error
In which sampling method does every unit have an equal nonzero chance of being selected?
Simple random sampling
What is the first step in developing a sampling plan?
Define the population of interest
What term describes a list of population elements from which units can be sampled?
Sampling frame
What term describes a complete set of items that are the subject of research in statistics?
Population
What happens when certain elements of the population are accidentally omitted from the sampling frame?
Sample frame error
What is the method called where the target population is ordered and the sample is selected according to a position using a skip interval?
Systematic random sampling
What step involves determining the number of units in a list and the desired sample size for
systematic random sampling?
Determine the number of units in the list and the desired sample size
What is a common issue when elements are accidentally omitted from the sampling frame?
Sample frame error
What is the term for the sub-set of data taken from the population of interest?
Sample
What error is shown when a selected sample is not representative of the population?
Sampling error
In what type of sampling is the population divided into different subgroups and samples are drawn from each?
Stratified random sampling
What must be done after dividing the target population into subgroups in stratified random sampling?
Draw random samples from each stratum
Why is it difficult to get an accurate sampling frame?
Because it is hard to list all elements of a population accurately
What are the elements selected in a sampling process referred to as?
Sampling units
What is a common challenge in creating an accurate sampling frame?
It is difficult to get an accurate list of population elements
Which sampling technique is used when natural groupings are evident in a population, like schools or cities?
Cluster sampling
What is the final step in executing a sampling plan?
Execute the sampling plan
Give an example of an element that might be included in a sampling frame.
People, companies, houses, cities
Name one basis for defining a population of interest.
Geographic area, demographics, usage/lifestyle, or awareness
Name a source that provides examples of sampling frames
Survey Sampling International
What is a sampling method that relies on convenience, judgment, quota, or snowball techniques?
Nonprobability sampling
What is the purpose of identifying a sampling frame in the sampling plan?
To list population elements from which units to be sampled can be selected
What type of error can occur if the sampling frame does not accurately reflect the population?
Sampling frame error