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B: More About Calculations 135
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[
[
∑
Q
-------=
y
y
∑
Q
-------=
[
[\
∑
\
∑
----------=
Sx
[
∑
[
∑
()
2
Q
--------------
–
Q
–
-------------------------------
=
Sy
y
∑
y
∑
()
2
Q
--------------
–
Q
–
------------------------------
=
σx
[
∑
[
∑
()
2
Q
--------------
–
Q
-------------------------------
=
σy
y
∑
y
∑
()
2
Q
--------------
–
Q
------------------------------
=
r
xy
∑
x
∑
y
∑
n
---------------
–
x
2
∑
x
∑
()
2
n
--------------
–
y
2
∑
y
∑
()
2
n
--------------
–
----------------------------------------------------------------------------
=
m
xy
∑
x
∑
y
∑
n
---------------
–
x
2
∑
x
∑
()
2
n
--------------
–
--------------------------------
=
bymx–=
x
ˆ
yb–
m
-----------
= y
ˆ
mx b+=
.fm Page 135 Thursday, June 22, 2000 12:33 PM