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MBB2
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Distributions of Data
Histogram
Central tendency
where most people are placed at and the peak of the diagram
Normal Distribution
Majority of observations are in the middle
Observations reduce in frequency towards the tails
The distribution is symmetrical
Typical scores
towards the centre scores (most frequent)
Extreme Scores
is very high or low scores
The 2s Rule of Thumb
In a distribution with a normal shape, 95% of scores fall within approximately 2 stranded deviations (s) of the mean