Data Management Learning Goals: Interpret and evaluate data in tables and graphs Draw labelled graphs by hand and with a computer

Circle Graph (Pie Chart) Displays data using a circle divided into sectors. We use a circle graph (also called a pie chart) to show how data represent portions of one whole or one group. Notice that each sector is represented by %

Bar Graph Displays data by using bars of equal width on a grid. The bars may be vertical or horizontal. Bar graphs are used for comparisons.

Pictograph Uses pictures and symbols to display data; each picture or symbol can represent more than one object; a key tells what each picture represents.

Broken Line Graph A graph showing data points joined by line segments to show trends over time.

Continuous Line Graph A graph in which points on the line between the plotted points also have meaning. Sometimes, this is a “best fit” graph where a straight line is drawn to fit the data points. Notice that the independent variable is on the X axis, & the dependent is on the Y axis.

Scatter Plots A graph of data that is a set of points.

Parts of a Graph:   Title: Summarizes information being represented in ANY graph. Independent Variable: The variable that is controlled by the experimenter, such as, time, dates, depth, and temperature. This is placed on the X axis. Dependent Variable: The variable that is directly affected by the I.V. It is the result of what happens as time, dates, depth and temperature are changed. This is placed on the Y axis. Scales for each Variable: In constructing a graph, one needs to know where to plot the points representing the data. In order to do this a scale must be employed to include all the data points.

Jamie bought a new video game and decided to keep track of his scores. Try 1 – 150 pts Try 2 – 190 pts Try 3 – 500 pts Try 4 – 900 pts Try 5 – 1100 pts Try 6 – 1500 pts Create a graph of Jamie’s progress. Put the “trys” on the X axis