Section 2.3 Analyzing Graphs Copyright © 2008 by Hawkes Learning Systems/Quant Systems, Inc. All rights reserved. HAWKES LEARNING SYSTEMS math courseware specialists Section 2.3 Analyzing Graphs

HAWKES LEARNING SYSTEMS math courseware specialists Graphical Descriptions of Data 2.3 Analyzing Graphs Shapes of Distribution: Uniform – the frequency of each class is relatively the same. (1 out 10 chance) Symmetrical – the data lies evenly on both sides of the distribution. (50% and 50%) Skewed to the Right – the majority of the data falls on the left of the distribution. Skewed to the Left – the majority of the data falls on the right of the distribution.

HAWKES LEARNING SYSTEMS math courseware specialists Graphical Descriptions of Data 2.3 Analyzing Graphs Definitions: Time-series – a picture of how data changes over time. ($10 in 2009, $15 in 2010, etc.) Cross-sectional study – a picture of the data at a given moment of time. (10 students with Average GPA 3.5) Outlier – a data value that falls outside the normal shape of the graph. (GPA of 2.0 out of the average GPA of 3.9)

HAWKES LEARNING SYSTEMS math courseware specialists Graphical Descriptions of Data 2.3 Analyzing Graphs Look at the two graphs shown below depicting the same data on people’s satisfaction level with their local shopping mall. Which graph is more accurate and why?