Math of Geography Flashcards

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1
Q

why is calculating standard deviation useful?

A
  • useful in determining vallitidy in the data set
  • a number above 1 means there is a large spread of data around the mean
    > not a lot of clustering
    > many extreme values
  • standard deviation is able to show the extent of fluctuations in standard deviations over time
    > able to compare data sets easily
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2
Q

how to calculate percentage change

A

difference ( final - initial) / initial number x 100

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3
Q

how to calculate percentage decrease

A

initial - final/ initial x 100

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