How_To_Be_Good_At_Math

STATISTICS • DATA HANDLING 269

This table, called a frequency table,

shows the number of children that

preferred each type of fruit.

A bar chart, also called a bar graph, is a

diagram that shows data without the

need for lots of words or lists of numbers.

What do we do with data?

Once data has been collected it needs to

be organized and presented. Tables, charts,

and graphs are quick ways of making data

easy to read and understand. Most popular fruit

The number of children is

shown on the vertical scale

Subset

of girls

Subset

of boys

Set

(whole

class)

NUMBER OF CHILDREN

The higher the

bar, the more

children like

that fruit

8 7 6 5 4 3 2 1 0

Orange Apple Grapes Watermelon Banana

The class of children that the robots

asked about their favourite fruit is

a set. The class contains 24 children,

a mixture of boys and girls.

The eight boys (shown in red) are

a subset of the class. The 16 girls

(green) are also a subset. Together,

they form the set of the whole class.

Most popular fruit

Type of fruit Number of

children

Orange

Apple

Grapes

Watermelon

Banana

TYPE OF FRUIT

Data sets

A set is a collection of data. It can be a group of numbers, words, people,

events, or things. Sets can be divided into smaller groups called subsets.

3

6

8

2

5

268_269_Data_handling.indd 269 29/02/2016 18:06