Question

Determine whether the following should be classified as simple random, systematic, convenience, stratified, or cluster sampling.

   ?    SimpleRandom    Systematic    Convenience    Stratified    Cluster      1. Every student in two different 8:00 classes on Tech's campus is selected to complete a survey

   ?    SimpleRandom    Systematic    Convenience    Stratified    Cluster      2. 50 people from each parish in Louisiana are asked political questions

   ?    SimpleRandom    Systematic    Convenience    Stratified    Cluster      3. Students are assigned numbers and a random-number generator selects students to participate in a survey

   ?    SimpleRandom    Systematic    Convenience    Stratified    Cluster      4. A researcher goes to the library to collect some published data

Answer 1

• Simple Random Sampling: A simple random sample (SRS) of size n is produced by a scheme which ensures that each subgroup of the population of size n has an equal probability of being chosen as the sample.
• Stratified Random Sampling: Divide the population into "strata". There can be any number of these. Then choose a simple random sample from each stratum. Combine those into the overall sample. That is a stratified random sample.
• Cluster Sampling: Cluster sampling is a method where the researchers divide the entire population into sections or clusters that represent a population. And then some clusters are chosen as sample.
• Systematic Sampling: Using systematic sampling method, members of a sample are chosen at regular intervals of a population. It requires selection of a starting point for the sample and sample size that can be repeated at regular intervals.

Convenience sampling: This method is dependent on the ease of access to subjects such as surveying customers at a mall or passers-by on a busy street. It is usually termed as convenience sampling, as it’s carried out on the basis of how easy is it for a researcher to get in touch with the subjects.

ANSWERS

1. Every student in two different 8:00 classes on Tech's campus is selected to complete a survey:

CLUSTER SAMPLING- As every student of the two classes ( ma be treated as cluster) are selected. so this is a cluster sampling.

2. 50 people from each parish in Louisiana are asked political questions

STRATIFIED SAMPLING- as parish in louisiana is considered as strata and samples (50 people) from each strata i.e parish is taken

3. Students are assigned numbers and a random-number generator selects students to participate in a survey

SIMPLE RANDOM SAMPLING- As here each student has an equal chance of being selected.

4. A researcher goes to the library to collect some published data.

CONVENIENCE SAMPLING- As it is convenient for the researcher to collect the published data from a library.