Section 1
Populations and Samples
Book
Version 1
By Boundless
By Boundless
Boundless Statistics
Statistics
by Boundless
5 concepts
![Thumbnail](../../../../../../figures.boundless-cdn.com/17956/square/census-bureau-seal.jpeg)
Populations
In statistics, a population includes all members of a defined group that we are studying for data driven decisions.
![Thumbnail](../../../../../../figures.boundless-cdn.com/17955/square/sample.jpg)
Samples
A sample is a set of data collected and/or selected from a population by a defined procedure.
![Thumbnail](../../../../../../figures.boundless-cdn.com/17957/square/sample.jpg)
Random Sampling
A random sample, also called a probability sample, is taken when each individual has an equal probability of being chosen for the sample.
![Thumbnail](../../../../../../figures.boundless-cdn.com/17964/square/cense-subsp.-macrocephalum.jpeg)
Random Assignment of Subjects
Random assignment helps eliminate the differences between the experimental group and the control group.
![Thumbnail](../../../../../../figures.boundless-cdn.com/17952/square/the-scientific-method.jpg)
Surveys or Experiments?
Surveys and experiments are both statistical techniques used to gather data, but they are used in different types of studies.