Ap Stats Formula Sheet
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1
2
3®
2009 AP
STATISTICS FREE-RESPONSE QUESTIONS
Formulas
(I)
Descriptive Statistics
Â
x i
=
x
n
(
)
2
1
=
-
Â
s
x
x
-
x
i
n
1
(
)
(
)
-
+
-
2
2
n
1
s
n
1
s
1
2
1
2
=
s
(
) (
)
p
-
+
-
n
1
n
1
1
2
=
+
ˆ y
b
b x
0
1
(
)(
)
-
-
Â
x
x y
y
=
i
i
b
(
)
1
2
-
Â
x
x
i
=
-
b
y
b x
0
1
-
Ê
-
ˆ
Ê
ˆ
x
x
y
y
1
=
i
i
Â
Á
˜
r
Á
˜
-
Ë
¯ Ë
n
1
s
s
¯
x
y
s
y
=
b
r
1
s
x
(
)
2
-
Â
ˆ
y
y
i
i
-
n
2
=
s
(
)
b
2
1
-
Â
x
x
i
-3-
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