135
Langkah – langkah perhitungan :
1. Rata – rata subgrup :
Rumus
:
X
k
=
?
Xi
n
Dimana : n = ukuran subgrup, yaitu banyaknya data dalam satu subgrup
k = jumlah subgrup yang terbentuk
X
i
= data pengamatan
X1 =
X1+ X 2 + X3+ X 4 + X5
=
162,69+187,7 +155,04+175,63+ 226,17
=181,446
5
5
X
2
=
X
6
+
X
7
+
X8+ X9 + X10
=
169,59+ 214,57+189,84+ 205,45+192,36
=194,362
5
5
X3 =
X11+ X12+ X13+ X14+ X15
=
168,96+174,84+185,17+223,4+211,21
=19²,716
5
5
X
4
=
X16+ X17+ X18+ X19+ X 20
=
206,32+192,14+178,02+189,96+ 202,45
=19³,778
5
5
X5 =
X
21+ X 22+ X 23+ X 24+ X 25
=
217,39+
227,36+182,22+170,04+199,32
=199,266
5
5
X
6
=
X
26+ X 27+ X 28+ X 29+ X30
=
211,46+193,46+165,78+181,16+ 202,84
=190,94
5
5
2. Rata – rata keseluruhan :
Rumus
:
X
=
?
X
k
k
X
=
?
Xk
=
X
1
+
X
2
+
X
3
+
X
4
+
X
5
+
X
6
=
1152,508
=
192,08
k
6
6
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