Graphing 1 Pie Graphs Dependent variable is NOT

Graphing 1

Pie Graphs • Dependent variable is NOT continuous • Usually presents data as a “part of a whole” or as percentages 2

Bar Graphs • • Dependent variable is NOT continuous There is no order to the categories on the X-axis Bars typically don’t touch Y-axis is usually a percentage or a frequency (count) 3

Histograms • A specific type of bar graph • Dependent variable must have a natural order that can be grouped into defined “chunks” • Bars must always touch • Y-axis is usually a percentage or a frequency (count) 4

Box and Whisker Plots • Used to display a set of data so that you can easily see where most of the numbers are. 5

Stem and Leaf Plot • similar to a histogram but shows more information. • summarizes the shape of a set of data (the distribution) and provides extra detail regarding individual values. • The data is arranged by place value. Test Scores Out Of 100 Stem Leaf 9 2268 8 35 7 246889 6 14478 5 00288 6

Line Graphs • Dependent variable IS continuous • Points are plotted using xand y-components • The points are connected because the observations are NOT independent (the next value depends on the previous value) 7

Scatter Plots • Dependent variable IS continuous • Points are plotted using x- and ycomponents • The points are NOT connected because the observations are independent (the next value does NOT depend on the previous value) • Uses a best-fit line or curve to show relationship 8

Cumulative Frequency Graph plotted from a cumulative frequency table the running total of the frequencies also called an ogive 9