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Statistics, Graphs and ExamplesPowerPoint Presentation

Statistics, Graphs and Examples

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**thina** - Follow User

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Measures of Central Tendency

- Mean: Average; sum divided by number of measurements in a data set
- Median: Middle number in a data set
- Mode: Most frequently occurring number in a data set

X-Y Scatterplot

- Graph used to determine the relationship between two variables
- Relationship may be positive, negative or non-existent
- Correlation does not mean causation!!!

Bar Graph

- Histogram
- Graph used to show frequencies on the Y axis and characteristics on the X axis
- Used for discrete data

Line Graph

- Graph used to plot continuous data over time
- X axis contains timeline, Y axis shows frequencies

Pie Chart

- Graph used to show percentage of a meaningful whole

According to the Experts...

- Fonts with serifs are easier to read in print
- Fonts sans serif are easier to read when projected

Read Carefully...

- Random is not the same as a sample
- Be suspicious of research sponsored by a product supplier
- Celebrities often know little about their causes

In general…

- Use data from careful research and sampling polls
- Telling stories is useful to provide a personal touch
- It’s OK to give Personal opinion
- Use Internet research from a credible site
- Journals are preferable to popular periodicals

And, don’t forget...

- Know your subject
- Know your audience

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