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# Statistics: Basic Concepts: Key Terms

#### Lesson 2: Key Terms

/en/statistics-basic-concepts/what-is-statistics/content/

### Key terms

Let’s discuss the two types of statistics. Then we’ll cover a glossary of key terms you should know, and take a look at an example...

Two types of statistics

It’s important to know that statistics is broken up into two types: descriptive and inferential.

• Descriptive statistics helps you to organize a large amount of data through things like tables and graphs. These tools can help you to visually organize the results. We’ll talk more about tables and graphs later on in the tutorial.
• Inferential statistics involves making predictions based on a sample of data. It’s useful for identifying a trend (or pattern) when you have a large amount of information.

For example, if a researcher wanted to know the average salary of pilots in their country, it might be impossible to ask all of them. What they could do is collect a data sample from a smaller group of pilots. Based on the results, they could then infer or make an educated guess about the pilots' average salary.

Glossary of key terms

#### A real-world example of inferential statistics

How might you use inferential statistics? Consider this: local elections are being held in your city. The town newspaper wants to predict who will be voted mayor.

Polling the whole population would require a lot of time and money, so the newspaper decides to send out surveys to a sample instead.  Then they can analyze the data and infer which candidate might win.

• Population: all of the voters in the city
• Sample: 5,000 voters who took part in the survey
• Data: the number of people who would vote for Candidate A, and the number of people who would vote for Candidate B

In the next lesson, we’ll start exploring the concept of variables

/en/statistics-basic-concepts/variables/content/