# Understanding  Sampling Methods

Sampling methods refer to the process of selecting a representative group or subset from a larger population for research, analysis, or statistical purposes. The sample selected must be an accurate representation of the population being studied to obtain valid results.

There are two basic types of sampling methods - probability sampling and non-probability sampling. In this post, we will cover the six most popular questions about "Sampling Methods."

## What is Probability Sampling?

Probability sampling involves randomly selecting participants from a larger population using techniques such as simple random sampling, systematic random sampling, stratified random sampling, and cluster sampled based on predetermined probabilities. This method guarantees equal chances for each member in the target population to be chosen.

## What is Non-Probability Sampling?

Non-probability sampling refers to techniques that do not include strict randomization procedures such as convenience or purposive samples where individuals/self-select themselves into the study; snowball-sampling referring friends/family who also participate in collecting data

## What is Sampling Bias?

Sampling bias refers to errors due to systematic flaws in how participants were recruited or selected which can result in invalid conclusions because certain groups have been over/or underrepresented leading towards biased findings.

## What is Sampling Frame?

A surveying tool used when choosing subjects for a study from as large pool possible within parameters intended by researchers beforehand ,such as geographical location age range gender etc ensuring there are no unintended biases introduced during selection process.

## How is Sample Size Determined?

Sample size determination depends on factors such as degree of accuracy desired level (precise enough) along with individual variability existing among units comprising (homogeneous/heterogeneous)

# References

1. Wonnacott T.H., Wonnacott R.J., Introductory Statistics 5th Ed.
2. Dillman D.A., Mail and Telephone Surveys: The Total Design Method
3. Kish L., Survey Sampling
4. Cochran W.G., Sample Survey Techniques
5. Groves R.M., Survey Methodology