02 penyajian data
DESCRIPTION
Aneka ragam penyajian data, di antaranya diagram batang, diagram lingkaran, dan histogram.TRANSCRIPT
DESCRIBING DATA
DATA PRESENTATION
GRAPHIC PRESENTATIONOF 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.
MINUMAN FAVORIT RESPONDENBeverage Number
Cola-Plus 40
Coca-Cola 25
Pepsi 20
Lemon-Lime 15
Cola-Plus Coca-Cola Pepsi Lemon-Lime05
1015202530354045
TINGKAT PENDIDIKAN TERAKHIRPEKERJA 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
PRESENTATION OF QUANTITATIVE DATA
• Frequency distribution table• Histogram• Frequency polygon• Cumulative frequency distribution• Cumulative frequency polygon
FREQUENCY DISTRIBUTION
• a grouping of data into mutually exclusive classes showing the number of observations in each class.
Hasil sampling mengenaiusia 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
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
(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
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.
Menentukan banyak kelas
• Banyaknya data = n = 30• Carilah bilangan asli k sekecil-kecilnya
sedemikian hingga 2k > 30• Jawab: k = 5
Menentukan lebar kelas
• H= 53• L = 7• i ≥ 9,2• i = 10
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
Distribusi Frekuensi Relatif
NO. USIA (TAHUN) FREKUENSI FREK. RELATIF1 5 - 14 2
0,072 15 - 24 5 0,173 25 - 34 11 0,374 35 - 44 7 0,235 45 - 54 5 0,17
JUMLAH 30 1,00
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.