Types of Graphs

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Types of Graphs
Scatterplots Use when you have 2 types of
measurements (variables) for a single sample and
want to look at the relationship between them.
Histograms/Bar Graphs Use when you are
comparing one variable between two samples, or
looking at a frequency distribution.
Pie Charts Use only if you are looking at
percentages that add up to 100.
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Summarizing Data
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Summarizing Data Further Beyond the Mean
Sample 1
Sample 2
Mean
Standard Deviation tells you how much your data
deviate from the mean. The greater the standard
deviation, the bigger the spread of data.
St.Dev.
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Summarizing Data Further Beyond the Mean
Sample 1
Sample 2
Stdev 0.86 1.21
Stdev 0.39 0.27
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Using Statistics with Scatterplots
R2 tells you how well your data fit the line, or
how much variability is in your data. An R2 of 1
means that all your data points lie directly on
the line.