# PSYA01H3 Chapter Notes - Chapter 2: Standard Deviation, Descriptive Statistics, Fine Motor Skill

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12 Aug 2016
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There are two techniques for making sense of big pages full of numbers (measurements
collected): graphic representations and descriptive statistics
Graphic representations
Frequency distribution – a graphic representation of measurements arranged by the number of
oMost common kind of graphic representation
oCan have any shape
oDepicts every measurement and thus provides a full and complete picture of those
measurements
oThe diagram below shows a pair of frequency distributions that represent the
hypothetical performances of a group of men and women who took a test of fine motor
skill
oEvery possible score is shown on the horizontal axis
oThe number of times (or the frequency with which) each score was observed is shown
on the vertical axis
oThe diagram below reveals the following:
The shape of the distributions instantly tells you that most people have
moderate motor skills
Only a few have exceptionally good or exceptionally bad motor skills
The distribution of men’s scores is displaced a bit to the left of the distribution
of women’s scores, which instantly tells you that women tend to have
somewhat better motor skills than men
The two distributions have a great deal of overlap, which tells you that although
women tend to have better motor skills than men, there are still plenty of men
who have better motor skills than plenty of women
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