1. Properties of Bar Graphs  Bars can be vertical or horizontal  Bars are of uniform width and uniformly spaced  Length of bars represent value of variable being displayed  Graph has title, labels for each bar and scale for length of bar  Bars can be vertical or horizontal  Bars are of uniform width and uniformly spaced  Length of bars represent value of variable being displayed  Graph has title, labels for each bar and scale for length of bar

2. Data for Bar Graph A recent study on Bronze Age spearheads recovered from ancient rivers in Ireland provided the following information: RiverBahnBlackwaterErneShannonBarrow Number198153314

3. Bronze Spearheads in Irish Rivers

4. Other Types of Charts  A Pareto chart is a bar graph in which the bar height represents the frequency of an event. In addition, the bars are arranged from left to right according to decreasing height.  In a circle graph (or pie chart), wedges of a circle display proportional parts of the total population that share a common characteristic.  A Pareto chart is a bar graph in which the bar height represents the frequency of an event. In addition, the bars are arranged from left to right according to decreasing height.  In a circle graph (or pie chart), wedges of a circle display proportional parts of the total population that share a common characteristic.

5. Bronze Spearheads in Irish Rivers

6. Time Series Graphs  In a time series graph, data are plotted in order of occurrence in regular intervals over a period of time.  Time series data consists of measurements of the same variable for the same subject taken at regular intervals over a period of time.  In a time series graph, data are plotted in order of occurrence in regular intervals over a period of time.  Time series data consists of measurements of the same variable for the same subject taken at regular intervals over a period of time.

7. Margin of Victory

8. Heights of Boys vs. Age Age in Years