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 3
105
?
?
a
=
2.S '
t
-S"
t
a3
=
2.S 3 -S"3
'3 -S"3
=
2 * 23.67 – 22.19 = 25.15
b
=
a
1
-
a
(S
'
t
-S"
)
b3
=
a
1
-
a
(S '3
-S"3
)
=
0.1
1
-
0.1
(23.67 - 22.19) = 0.16
F
(t +m
=
a
+
b
t
.m
Pada periode ke-3, m = 1.
F3
=
a2 + b2
.m
= 22.57 + 0.03 * 1 = 22.60
e
=
X
-
F
t
e3
=
X
-
F3
=
36 – 22.60 = 13.40
|e3| = 13.40
?
-
F
?
PE 
= ?                
t  
?
*100
t
X
?
t
?
?
X
-
?
?
-
?
PE 
=
?    
           3
3
?
*100 =
?
36
22.60
?
*100 = 37.22
?
X
3
?
?
36
?
|PE3| = 37.22
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