standard deviation Flashcards

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1
Q

what is standard deviation?

A
  • tells us how spread out the data is from the mean and gives us more information than just the average
  • high SD = data very spread out from the mean
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2
Q

how do you calculate standard deviation?

A
  • calculate the mean
  • subtract the mean from each value in the data set
  • square each result from step 2
  • calculate the mean of those squared differences but instead of dividing by the number of values, divide by THE NUMBER OF VALUES MINUS 1. (this gives the variance)
  • square root the final number in step 4 to get standard deviation
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