Aneka ragam penyajian data, di antaranya diagram batang, diagram lingkaran, dan histogram.

1. DESCRIBING DATA
DATA PRESENTATION

2. GRAPHIC PRESENTATION
OF QUALITATIVE DATA
• Bar chart: a graph that shows qualitative
classes on the horizontal axis and the class
frequencies on the vertical axis. The class
frequencies are proportional to the heights of
the bars.
• Pie chart: a chart that shows the proportion or
percentage that each class represents of the
total number of frequencies.

3. MINUMAN FAVORIT
RESPONDEN
Beverage Number
Cola-Plus 40
Coca-Cola 25
Pepsi 20
Lemon-Lime 15
0
10
20
30
40
50

4. TINGKAT PENDIDIKAN TERAKHIR
PEKERJA DI PT “SUMBER MAKMUR”
PENDIDIKAN
TERAKHIR
BANYAKNYA
PEKERJA
SD 35
SMP 80
SMU/SMK 153
D3 40
S1 15
S2 5
SD, 35
SMP, 80
SMU/SMK, 153
D3, 40
S1, 15
S2, 5

5. PRESENTATION OF QUANTITATIVE
DATA
• Frequency distribution table
• Histogram
• Frequency polygon
• Cumulative frequency distribution
• Cumulative frequency polygon

6. FREQUENCY DISTRIBUTION
• a grouping of data into mutually exclusive
classes showing the number of observations in
each class.

7. Hasil sampling mengenai
usia pengguna internet
50 7 30 42 32 47
36 27 15 41 16 26
37 30 31 53 11 29
36 20 31 43 30 19
45 26 22 41 30 48

8. Contoh 1:
Usia Pengguna Internet (hasil sampling)
No. Usia (tahun) Frekuensi
1 5 hingga15 2
2 15 hingga25 5
3 25 hingga 35 11
4 35 hingga 45 7
5 45 hingga 55 5

9. (alternatif)
No. Usia (tahun) Frekuensi
1 5 -14 2
2 15 - 24 5
3 25 - 34 11
4 35 - 44 7
5 45 - 54 5

10. CONSTRUCTING FREQUENCY DISTRIBUTION
• Decide on the number of classes.
• Determine the class interval/class width.
• Set the individual class limits.
• Tally the data into the classes.
• Count the numberof items in each class.

11. Menentukan banyak kelas
• Banyaknya data = n = 30
• Carilah bilangan asli k sekecil-kecilnya
sedemikian hingga 2k > 30
• Jawab: k = 5

12. Menentukan lebar kelas
• H= 53
• L = 7
• i ≥ 9,2
• i = 10

13. Menetapkan batas-batas kelas
• Total jangkauan = 5.10 = 50
• Jangkauan aktual = 46
• Kelonggaran = 50 – 46 = 4
• Kelonggaran/2 =4/2 = 2
• Batas bawah kelas pertama = 7 – 2 = 5
No. Usia (tahun)
1 5 hingga15
2 15 hingga25
3 25 hingga 35
4 35 hingga 45
5 45 hingga 55

14. Distribusi Frekuensi
Relatif
NO. USIA (TAHUN) FREKUENSI FREK. RELATIF
1 5 - 14 2 0,07
2 15 - 24 5 0,17
3 25 - 34 11 0,37
4 35 - 44 7 0,23
5 45 - 54 5 0,17
JUMLAH 30 1,00

15. HISTOGRAM
• a graph in which the classes are marked on the
horizontal axis and the class frequencies on the
vertical axis. The class frequencies are
represented by the heights of the bars, and the
bars are drawn adjacent to each other.