Fit Lines to Scatter Plots
Middle School Math · Flashcards · Application
MIDDLE SCHOOL MATH · FLASHCARDS
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QUESTION
If a data point is at
(
3
,
9
)
(3,9)
(
3
,
9
)
and the model predicts
y
=
7
y = 7
y
=
7
at
x
=
3
x = 3
x
=
3
, what is the residual?
QUESTION
If a fitted line is
y
=
−
3
x
+
10
y = -3x + 10
y
=
−
3
x
+
10
, what is the predicted
y
y
y
when
x
=
2
x = 2
x
=
2
?
QUESTION
What is the predicted
y
y
y
if the fitted line is
y
=
3
x
+
1
y=3x+1
y
=
3
x
+
1
and
x
=
4
x=4
x
=
4
?
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ANSWER
y
=
13
y=13
y
=
13
. Substitute
x
=
4
x=4
x
=
4
into equation:
y
=
3
(
4
)
+
1
=
12
+
1
=
13
y=3(4)+1=12+1=13
y
=
3
(
4
)
+
1
=
12
+
1
=
13
.
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