Correlation
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5 Terms
How to calculate arithmetic mean
Sum all individual elemets of the variable
Divide by the number of elements
How to calculate variance
Subtract each observation of each participant from the sample mean
Square that and add up all the values
Divide by n-1 where n = the number of observations
How to calculate standard deviation
Square root of variance
How to calculate covariance
Subtract the mean x from each x-value (xᵢ − x̄).
Subtract the mean y from each y-value (yᵢ − ȳ).
Multiply these two results for each pair.
Add up all those products.
Divide the total by (n − 1).
How to calculate correlation
Subtract the mean x from each x-value (xᵢ − x̄).
Subtract the mean y from each y-value (yᵢ − ȳ).
Multiply these two results for each pair.
Add up all those products.
Multiply SD of x by SD of y
Divide the first part by the second
Note 
Flashcards (40)