question archive Which sampling method was used: A large chain of stores chooses a random sample of their stores and surveys all employees of those stores about their satisfaction with their jobs and work environment
Which sampling method was used: A large chain of stores chooses a random sample of their stores and surveys all employees of those stores about their satisfaction with their jobs and work environment
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Which sampling method was used:
A large chain of stores chooses a random sample of their stores and surveys all employees of those stores about their satisfaction with their jobs and work environment.
- An instructor forgets to ask students to fill out the teaching evaluation survey before the end of classes. In the week before the final exam, the instructor gets everyone who comes to office hours to fill out the teaching evaluation.
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In the first case, cluster random sampling method is used.
In the second case, convenience sampling method is used.
Cluster random sampling :
It is a sampling plan used when mutually homogeneous yet internally heterogeneous groupings are evident in a statistical population. Most often, it is used in marketing research. In this sampling plan, the total population is divided into these groups (clusters) and a simple random sample of the groups is selected. The elements in each cluster are then sampled. If all elements in each sampled cluster are sampled, then this is called as a "one-stage" cluster sampling plan. This is referred to as a "two-stage" cluster sampling plan, if a simple random subsample of elements is selected within each of these groups. Given the desired accuracy, a common motivation for cluster sampling is to reduce the total number of interviews and costs. The expected random error, for a fixed sample size, is smaller when most of the variation in the population is present internally within the groups, and not between the groups.
Convenience sampling :
It is a type of non-probability sampling method in which the sample is taken from a group of people easy to contact or to reach. For example, standing at a grocery store or a mall and asking people to answer questions would be an example of a convenience sampling. This kind of sampling is also known as grab sampling or availability sampling. There are no other criteria to the sampling method except that people be available and willing to participate. In addition, this type of sampling method does not require that a simple Random sample is generated, as the only criteria is whether the participants agree to participate.
