Sampling Techniques, Bias, and Data Types

All individuals or items that belong to a group being studied

• Sample

• Population

• Bias

• Survey

A group of individuals or items that are representative of the population from which they are taken.

• Sample

• Population

• Bias

• Survey

prejudice in favor of or against one thing, person, or group compared with another, usually in a way considered to be unfair.  

• Sample

• Population

• Bias

• Survey

Each member of the population has an equal chance of being selected. 

• Simple Random

• Stratified Random

• Cluster

• Convenience

The population is divided into subgroups and a random sample is selected from each subgroup in proportion to its size in the population. 

• Simple Random

• Stratified Random

• Cluster

• Convenience

The population is divided into groups and a certain number of groups are chosen. Every member of these groups is part of the sample

• Simple Random

• Systematic

• Cluster

• Convenience

Every nth member of the population is selected. 

• Voluntary

• Systematic

• Cluster

• Convenience

The sample contains those members of the population from which data are most easily collected.

• Voluntary

• Systematic

• Cluster

• Convenience

The sample contains those members of the population who have chosen to respond to the survey

• Voluntary

• Systematic

• Cluster

• Convenience

The following graph is a:

• Histogram

• Bar Graph