Descriptive statistics is about describing our collected data using the measures discussed throughout this lesson: measures of center, measures of spread, shape of our distribution, and outliers. We can also use plots of our data to gain a better understanding.
Inferential Statistics is about using our collected data to draw conclusions to a larger population. Performing inferential statistics well requires that we take a sample that accurately represents our population of interest.
A common way to collect data is via a survey. However, surveys may be extremely biased depending on the types of questions that are asked, and the way the questions are asked.
We looked at specific examples that allowed us to identify the:
- Population – our entire group of interest.
- Parameter – numeric summary about a population.
- Sample – subset of the population.
- Statistic – numeric summary about a sample.