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Unformatted text preview: e height of the bar drawn above
each ‘thing’ being counted x axis shows the categories
that are being counted Bar graph: x axis is Nominal or Bar graph: x axis is Nominal or Ordinal scale
June 28th 2004, Ottawa Centre
30000 Number of votes 25000
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NDP LIB CON GRN MP IND Political party COM CAP ML Histogram: x axis is Interval or Histogram: x axis is Interval or Ratio scale Histogram of IQ levels
Number of individuals 30
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60 70 80 90 100
IQ score 110 120 130 140 Scatterplots show the relationship Scatterplots show the relationship (correlation) between variables
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0 0.2 0.4 0.6 0.8 1 Test 1 • Variables on both the x and y axes are interval or ratio scales
• Each point represents a participant in the study Basic Statistics
Basic Statistics
• Descriptive statistics – Used to describe data
• Provide an accurate summary of the important aspects of your data • using as few numbers as possible
Choice of statistic is determined by what you consider to be important • Inferential statistics – Used to make inferences or generalizations from data
• You have only made observations on a small sample
• How confident are you in generalizing your conclusions...
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 Winter '11
 Mathewyoung
 Psychology

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