GRAPHICAL DESCRIPTIVE STATISTICS

1
GRAPHICAL DESCRIPTIVE STATISTICS

• How do psychologists summarize their data
  pictorially?

2
BAR CHARTS

• Shows data only for those categories that the
  researcher is interested in comparing, e.g. two
  or more conditions in an experiment

3
HISTOGRAMS

• Shows data for all categories, even those with
  zero values. The column width for each category
  interval is equal so the area of the column is
  proportional to the number of cases it contains
  of the sample

4
FREQUENCY POLYGON

• Also known as a line graph, the frequency polygon
  is similar to a histogram, except that it allows
  two or more sets of data to be shown on the same
  graph.

5
PIE CHARTS

• Pie charts show the proportion of all scores
  gained by various categories. Proportions of the
  pie chart are calculated by the following formula

6
PIE CHARTS

• Degrees of score of x degrees
• pie chart category of a circle
• divided by total score

7
SCATTERGRAMS

• Scattergrams plot pairs of scores against each
  other to show their correlational relationship
• Emergent patterns or trends in the data can be
  calculated to show a line of best fit

8
NORMAL DISTRIBUTION

• Normal distribution curves occur in the
  populations of many continuous psychological
  variables and are involved in parametric
  statistics.
• They are bell shaped and symmetrical at the mid
  point where the mode, median and mean all fall

9
NORMAL DISTRIBUTION

• The percentage of scores covered by the areas
  between the standard deviations of the curve are
  known.