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9 Cards in this Set

  • Front
  • Back
range
the difference between the highest and lowest value in the set
Quartiles
q1 - lower quartile - n/4
q2 - median - n/2
q3 - upper quartile - 3n/4
q4 - highest value - n
the discrete rule
when result is a whole number, find the midpoint
when result is not whole number, round up
continuous grouped data
use interpolation to find the corresponding term
interquartile range
q3 - q1
Percentiles
Split into 100 parts
find the value of the xn/100th term
use interpolation
Variance
Measure spread of the data
standard deviation
square root of the variance
Coding
adding or subtracting does not affect standard deviation
mutliply or dividing does affect the data
to find s.d of original data, find coded s.d. then multiply/divide