3 - Graphing Frequency Distributions

# 3 - Graphing Frequency Distributions - Chapter 3: Graphic...

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Chapter 3: Graphic Representation of Frequency Distributions Graphs are meant to convey information as quickly and easily as possible Some basic rules to keep in mind…

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Identify your scale of measurement Is the data measured on a nominal scale? Interval? This will determine what graphs are appropriate Graphs need labels Must label your axes to know what they represent Includes creating a title for your graph
Graphing Frequency Distributions Frequency Dist. graphed in 2 dimensions X axis (abcissa) : The horizontal axis of a graph For frequency dist. Typically put scores or categories on this axis Y axis (ordinate) : The vertical axis of a graph Typically put frequencies on this axis

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Graphing Qualitative Data We can create frequency distributions for nominal data. No quantitative differences between our categories (e.g., gender, school major) Can turn this information into a Bar Diagram
Example Bar Diagram of Majors in a Psychology Class 0 1 2 3 4 5 6 7 8 Comm Educ Engr Finan Forest Nurs Psych Stat Undec Majors Majors on the X axis Frequencies on the Y axis Empty space between bars

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Space between bars indicates nominal categories For a different perspective, can create a Pie Chart Always uses relative frequencies (proportions or percentages)
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## 3 - Graphing Frequency Distributions - Chapter 3: Graphic...

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