Definitions
The average of a sample or population.
What is the mean?
μ
What is population mean?
The formula for obtaining a z-score.
z = (x-μ)/σ
This value can range from -1 to 1.
What is Pearson's r?
Half of the scores are above this value, the other half are below.
What is the median?
s
What is sample standard deviation?
The formula for standard deviation.
s=sqrt(SS/N-1)
The reason why not every data point will fall on our regression line.
What is error?
A measure of deviation from the mean of a data set.
What is Sum of Squares
Σx2
What is the sum of squared x-values?
r=SCP/Sqrt(SSxSSy)
The variability in y accounted for by x.
What is r^2?
A continuous probability distribution with a mean of 0 and a standard deviation of 1.
What is the z-curve?
d-hat
What is Cohen's D?
The formula for the Sum of Cross Product Deviations.
Σ(xy)-(Σ(x)Σ(y))/N
How many standard deviations from the mean of a z-distribution is a z-score of 2.3?
What is 2.3 standard deviations?
A term that describes when variability in X equals the variability in Y.
What is homoscedasticity?
ρ
The formula for the Standard Error of the Estimate.
Sqrt([SSy-((SCP)^2/SSx)]/N-2)
Yact-Ymean=(Ypred-Ymean)+(Yact-Ypred)