Question

Asked Dec 23, 2019

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Sampling Method The patients included in the study cited in Exercise 1 were those “who sought care for low-back pain directly or in response to a community advertisement.” What type of sampling best describes the way in which the 1643 subjects were chosen: simple random sample, systematic sample, convenience sample, stratified sample, cluster sample? Does the method of sampling appear to adversely affect the quality of the results?

Step 1

*Simple random sampling:*

If a sample of *n* subjects is selected, then every unit in the population has an equal chance of being selected into the considered sample. Then, it is termed as simple random sampling.

Step 2

*Systematic sampling:*

Systematic sampling involves first considering a starting point for selecting the sample and then selects every unit in the population.

*Convenience sampling:*

The convenience sample is taken using subjects that are easily available to be considered into the sample.

*Stratified sampling:*

In stratified sampling, the whole population is divided into two or more different subgroups, b...

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