Populations and Samples

In statistics, a population includes all members of a defined group that we are studying for data driven decisions.

A sample is a set of data collected and/or selected from a population by a defined procedure.

A random sample, also called a probability sample, is taken when each individual has an equal probability of being chosen for the sample.

Random assignment helps eliminate the differences between the experimental group and the control group.

Surveys and experiments are both statistical techniques used to gather data, but they are used in different types of studies.