We will consider two types of table that are useful to us as statisticians. These are **2-way tables** and **frequency tables**.

**2-way tables**

In a 2-way table, one **variable** is listed across the top (e.g. eye colour) and a different variable is listed along the side (e.g. hair colour) and the number of people with each different combinations is measured in the body of the table (sometimes called the **sample space**).

Here is an example of a 2-way table which looks at how many people of each gender wear glasses:

**Exercise**

Let’s complete exercise 6E from page 86 to practice reading information from frequency tables:

The answers are below:

**Frequency tables**

The most common type of table we will encounter in Statistics is the **Frequency Table**.

This is a very efficient way of summarising the information in a **dataset**. It will always be useful when making a frequency table to make a **tally-chart** first. Let’s see the process for the following dataset (what kind of data is it?):

We always check that we have completed the frequency chart correctly by checking that the sum of the frequencies equals the number of pieces of data in the dataset.

**Exercise**

Let’s complete exercise 6F from page 87 of the textbook:

The answers are below: