Further-Chapter 3- Summarising Numerical Data 2

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jt.mcrae
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59310
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Further-Chapter 3- Summarising Numerical Data 2
Updated:
2011-01-11 23:12:44
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Summarising Numerical Data
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Summarising Numerical Data 2
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  1. What is the mean
    • balance point of distribution
    • = sum of data/total number of data values
    • Written as
    • _
    • x or Ex/n
  2. What is the Standard deviation
    Is the spread of data around the mean

    • s= square root of E(x- mean)2/n-1or
    • s=r/4
  3. What is is the 68%-95%-99.7% rule
    • Normal distribution
    • 68% of data within one SD of mean
    • 95% of data within two SD of mean
    • 99.7% of data withing three SD of mean
  4. What is standardising data
    standard score (z)= data value- mean/ SD

    • positive score is above mean
    • negative score is below mean
    • 0 is equal to mean

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