summary of research methods part 3

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Summary of research methods part 3
Data analysis and presentation- graphs scattergrams and tables
Bar chart
Used when the IV is nominal
data the categories can be
presented in any order
Used when the IV is at least
ordinal data the categories
must go in the correct order.
Frequency polygon
Basically a histogram but with the
top of the bar joined with a line.
Shows the frequency of scores for
each category
Two or more lines can be shown to
show other conditions
Used when the IV is interval data
Generally used in conjunction with
correlation analysis

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Measures of central tendency
Mean- add up all the numbers and divide that total by the numbers in the
data set. So not use if there are any outliers as these will distort the mean-
use median instead.
Median- put the data in numerical order and select the middle number. It is
not as powerful as the mean
Mode- most common number. The mode doesn't take into account all the
Measures of dispersion
Range- A basic indication of the variation within the data set.…read more

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Strong Strong Weak positive Weak No correlation
positive negative correlation negative
correlation correlation correlation…read more


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