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 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