TUGAS 5
I. Hasil Ulangan Statistik sebagi berikut : 6, 7, 8, 6, 7, 7, 6, 5, 8 Hitunglah :
1. Deviasi rata-rata 2. Varians
3. Simpangan bakunya
Penyelesaian :
1. DEVIASI RATA-RATA
n
X
X
X
X
2
1
DR
X
6
7
8
6
7 + 7 + 6 + 5 + 8
9
6, 66
7
X
i
X
6 - 7
7 - 7
8 - 7
6 - 7
7 - 7
7 - 7
6 - 7
5 - 7
8 - 7
7
7
9
0, 77
DR
X
i
X
2. VARIANS
3. SIMPANGAN BAKU
X
6
7
8
6
7 + 7 + 6 + 5 + 8
9
6, 66
7
1
2
n - X X - s
9
9 - 1
1,125
s (XX)
2
n1
9
91
1,125
1, 060
X2
x
X
X
X X
26 -1 1 36
7 0 0 49
8 1 1 64
6 -1 1 36
7 0 0 49
7 0 0 49
6 -1 1 36
5 -2 4 25
8 1 1 64