Further-Chapter 3- Summarising Numerical Data 2
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What is the mean
balance point of distribution
= sum of data/total number of data values
Written as
_
x or Ex/n
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
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
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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Author:
jt.mcrae
ID:
59310
Filename:
Further-Chapter 3- Summarising Numerical Data 2
Updated:
2011-01-12 04:12:44
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Summarising Numerical Data
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Summarising Numerical Data 2
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