Statistics and Probability Dictionary
Select a term from the dropdown text box. The online statistics
glossary will display a definition, plus links to other
related web pages.
A sample design is made up of two elements.
Sampling method. Sampling method refers to the rules and
procedures by which some elements of the population are included in the sample.
Some common sampling methods are
simple random sampling
Estimator. The estimation process for calculating sample
statistics is called the estimator. Different sampling methods may use
different estimators. For example, the formula for computing a mean score with
a simple random sample is different from the formula for computing a mean score
with a stratified sample. Similarly, the formula for the
may vary from one sampling method to the next.
The "best" sample design depends on survey objectives and on survey resources.
For example, a researcher might select the most economical design that provides
a desired level of precision. Or, if the budget is limited, a researcher might
choose the design that provides the greatest precision without going over