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Statistics, Graphs and Examples. What you need to support your “must knows”. 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.

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Statistics graphs and examples

Statistics, Graphs and Examples

What you need to support your

“must knows”

Measures of central tendency
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
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
Bar Graph

  • Histogram

  • Graph used to show frequencies on the Y axis and characteristics on the X axis

  • Used for discrete data

Line graph
Line Graph

  • Graph used to plot continuous data over time

  • X axis contains timeline, Y axis shows frequencies

Pie chart
Pie Chart

  • Graph used to show percentage of a meaningful whole

According to the experts
According to the Experts...

  • Fonts with serifs are easier to read in print

  • Fonts sans serif are easier to read when projected

Read carefully
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
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
And, don’t forget...

  • Know your subject

  • Know your audience