Population Sampling

The Population and Sampling

The population is the entire group for which we want to draw conclusions using statistical analysis.

The sample consists of the specific units from the population for which we collect and observe data

Random Sampling

A sample of size $n$ is a simple random sample if each element of the population is equally likely to be sampled, or, that any possible sample of size $n$ is equally likely to be chosen

Sampling Bias

When the sample is not a simple random sample, it may introduce sampling bias