Circle Graphs, Line Graphs, and Scatter Plots

Data that shows change over time is best displayed in a line graph

The scale must include all of the data values. The interval separates the scale into equal parts

The scale and interval should be chosen such that all the data values can be clearly marked on the graph

Mark a point for the data set and connect the points

In a line graph, line segments are used to connect data points on a coordinate grid

A line graph is used to show how data changes over a period of time

To predict a value on a line graph, extend the line in that direction and find the corresponding values on the x or y axis

A double line graph is a method of displaying a set of data, often used to compare two sets of data and the changes in them over time

The scale must include all of the data values. The interval separates the scale into equal parts

The scale and interval should be chosen such that all the data values can be clearly marked on the graph

A circle graph, also called a pie chart, shows how a set of data is divided into parts

The entire circle contains 100% of the data. Each sector, or slice, of the circle represents one part of the entire data set

A smaller sector of the circle represents smaller part of the data and larger part of circle represents larger part of the data

A scatter plot has two number lines, called axes- one for each set of data values. Each point on the scatter plot represents a pair of data values

These points may appear to be scattered or may cluster in the shape of a line or a curve

The data sets plotted on the plot area said to be negatively correlated if the values in one data set increase as the values in the other set decreases

The data sets plotted on the plot area said to be positively correlated if the values in both data sets increase at the same time

The data sets plotted on the plot area not correlated if the values in both the data sets do not show any pattern