To compare two distributions can construct a back to back stem and leaf display

# To compare two distributions can construct a back to

This preview shows page 135 - 146 out of 146 pages.

To compare two distributions, can construct a back-to-back stem-and-leaf display Uses the same stems for both One leaf is shown on the left side and the other on the right 135
Sample Back-to-Back Stem-and-Leaf Display 136
Back-to-Back histogram Display Comparing Two Distributions with back-to- back bar charts 137
Back-to-Back histogram Display Comparing Two Distributions with back-to- back bar charts 138
Scatter Plots Used to study relationships between two quantitative variables Place one variable on the x-axis Place a second variable on the y-axis Place dot on pair coordinates 139
Types of Relationships Linear : A straight line relationship between the two variables Positive : When one variable goes up, the other variable goes up Negative : When one variable goes up, the other variable goes down No Linear Relationship : There is no coordinated linear movement between the two variables 140
A Scatter Plot Showing a Positive Linear Relationship 141
A Scatter Plot Showing a Little or No Linear Relationship 142
A Scatter Plot Showing a Negative Linear Relationship 143
Misleading Graphs and Charts: Scale Break Mean Salaries at a Major University, 2004 - 2007 Break the vertical scale to exaggerate effect 144
145 Misleading Graphs and Charts: Horizontal Scale Effects
146 You can use simple mathematical operations (like averages) to create nonsensical “facts” that can drive whatever agenda you’d like. Example: the average wealth of the citizens of a particular town is \$100,000, therefore they don’t need any government assistance. (The town consists of 1 stingy millionaire and 9 homeless people.)

#### You've reached the end of your free preview.

Want to read all 146 pages?

• Fall '19
• Frequency, Frequency distribution, Bar chart, Histogram