Final Flashcards
Standard error of estimate
Sy.x
Amount of error in a prediction, average deviation from line
Sy.x increases with
increased variance
Pearson r
measure of strength and direction of a relationship, linear only
r^2
variability in a factor associated with differences
Properties of r
From -1 to 1
+-1 is a perfect linear relationship
Unitless
Represents the strength/magnitude of a relationship
Direct relationship
+r
Inverse relationship
-r
As standard error increases
the greater the spread
y = bx + a
b = slope, a = y-intercept
Use corr t test for
matched groups, repeated measures, or when the data is clearly correlated
Repeated Measures
Same subjects in all conditions
For a t test, assume _____ of variance
homogeniety
The higher the ____, the more leptokurtic the t
N
As N increases, the standard deviation of t gets closer to
1
Directional tests are ____ powerful than non-directional test
more
