Scatter Plot and LSRL Quiz Review Flashcards

Interpretation of Standard deviation of the Residuals (s):

“The actual (y-context) is typically about (s) (Context/units)

away from the number predicted by the LSRL, when (x= x context).”

Interpretation of Coefficient of Determination (r²):

“About (r²%) of the variability in (y-context) is accounted for by the LSRL, when (x= x variable).”

Interpretation of correlation ( r )

“As x increases, y increases”

“As x increases y decreases”

“A pattern exists, but it’s nonlinear”

“There is no pattern”

How to describe a scatter plot in words?

FUDS

Form: linear or nonlinear

Unusual Features: outliers or clusters

Direction: positive or negative

Strength: very weak, weak, moderate, strong, very strong

Interpretation of slope

“With each additional 1 (x-context) the predicted (y-context) (increases/decreases) by (slope).”

interpretation of y intercept

when x=0 context the predicted y context is y-intercept

Interpretation of residual

The actual y-context was residual value higher/lower than predicted value for x=#