DESCRIBING DATA DATA PRESENTATION

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.

MINUMAN FAVORIT RESPONDEN Beverage Number Cola-Plus 40 Coca-Cola 25 Pepsi 20 Lemon-Lime 15

TINGKAT PENDIDIKAN TERAKHIR PEKERJA DI PT “SUMBER MAKMUR” BANYAKNYA PEKERJA 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 mengenai usia pengguna internet 50 7 30 42 32 47 36 27 15 41 16 26 37 31 53 11 29 20 43 19 45 22 48

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

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

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. RELATIF 1 5 - 14 2 0,07 15 - 24 5 0,17 3 25 - 34 11 0,37 4 35 - 44 7 0,23 45 - 54   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.