Saturday, January 21, 2012

Research- Bell Shaped Curves

kurtosis- not normal distribution

measures of central tendency: mean, median, mode

mean- average

median- middle score

mode- most frequently occuring score

- mean, median, mode all are same place on a bell shaped curve

variants- units on the bell shaped curve
68% of scores within one SD (standard deviations) on the curve
97% of scores are within 2 SD on the curve
99% of scores within 3 SD

variants- big picture

statistical regression- on a reliable curve we regress to the mean. 

standard deviations- one piece

Pie example- variants is the pie, SD is a slice

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