00:01
For this question, we need to distinguish two concepts.
00:03
The first one is population and the other one is sample.
00:11
A sample is usually a portion of the population.
00:16
The population is usually of interest.
00:21
We cannot get all the data from the population because it's too hard.
00:26
So we take a sample from the population.
00:31
We use the sample to make inferences about the population.
00:37
We want to estimate the parameter of the population.
00:42
We use the sample to estimate this.
00:45
For example, the population mean, population standard deviation, etc...