Statistics
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Correlation
When two sets of data are strongly linked together we say they have a High Correlation .
Data can be "distributed" (spread out) in different ways. It can be spread out more on the left ... or more on the right
Normal Distribution
Quartiles
Quartiles are the values that divide a list of numbers into quarters. First put the list of numbers in order Then cut the list into four equal parts The Quartiles are at the "cuts"
Calculating the mean from a frequency table
It is easy to calculate the Mean : Add up all the numbers, then divide by how many numbers there are. Example 1: What is the Mean of these numbers?Standard Deviation Formulas
Deviation just means how far from the normal Standard Deviation The Standard Deviation is a measure of how spread out numbers are .