Range: range = highest value - lowest value
Finding upper and lower quartiles:
Discrete data -
lower quartile (Q1) divide n by 4.
upper quartile (Q3) divide n by four and then multiple by 3.
Continuous data -
lower quartile (Q1) divide n by 4 and then use interpolation to find corresponding value.
upper quartile (Q3) divide n by four and multiple by three and use interpolation to find corresponding value.
Interquartile range: interquartile range = upper quartile - lower quartile
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