Linear Regression Models
AP Statistics · Flashcards
AP STATISTICS · FLASHCARDS
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QUESTION
What is the primary purpose of a regression model?
QUESTION
Identify the y-intercept in
y
=
−
2
x
+
6
y = -2x + 6
y
=
−
2
x
+
6
.
QUESTION
What is the formula for calculating the correlation coefficient
r
r
r
?
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ANSWER
r
=
cov
(
X
,
Y
)
std
(
X
)
×
std
(
Y
)
r = \frac{\text{cov}(X, Y)}{\text{std}(X) \times \text{std}(Y)}
r
=
std
(
X
)
×
std
(
Y
)
cov
(
X
,
Y
)
. Covariance divided by product of standard deviations.
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