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9 Cards in this Set
- Front
- Back
range
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the difference between the highest and lowest value in the set
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Quartiles
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q1 - lower quartile - n/4
q2 - median - n/2 q3 - upper quartile - 3n/4 q4 - highest value - n |
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the discrete rule
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when result is a whole number, find the midpoint
when result is not whole number, round up |
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continuous grouped data
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use interpolation to find the corresponding term
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interquartile range
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q3 - q1
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Percentiles
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Split into 100 parts
find the value of the xn/100th term use interpolation |
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Variance
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Measure spread of the data
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standard deviation
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square root of the variance
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Coding
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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 |