Dr. Kusman Sadik, M.Si

Sekolah Pascasarjana Departemen Statistika IPB

Semester Ganjil 2019/2020

Analisis Statistika (STK511)

IPB University─ Bogor Indonesia ─ Inspiring Innovation with Integrity

Statistika Deskriptif

In discussing the methods for providing summary

descriptions of data, it helps to distinguish

between the two basic types:

1. Qualitative or categorical data

2. Quantitative or numerical or

measurement data

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(1) Discrete variable : the scale is made up of

distinct numbers with gaps in between

data count (number of bacteria, number of

ion, number of star, etc).

(2) Continuous variable : the measurement

scale does not have gaps, such variables

are called continuous height, weight, time.

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Frequency table

Pie chart

Bar chart / histogram

Pareto chart

Lihat Johnson , hlm. 25-29

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Distribution frequency table

Histogram

Dot diagram

Stem-and-Leaf (diagram dahan-daun)

Lihat Johnson , hlm. 29-36

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The graphic procedures help us to visualize the

pattern of a data set of measurements.

To obtain a more objective summary description

and a comparison of data sets, we must go one

step further and obtain numerical values for the

location or center of the data and the amount of

variability present.

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Rata-rata (mean)

Median

Kuartil

Persentil

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Kuartil dan Persentil

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Artinya, paling sedikit 70 persen dari mahasiswa

peserta STK511 tersebut nilai ujiannya lebih kecil

atau sama dengan 80.5.

Berarti juga paling sedikit 30 persen dari mahasiswa

peserta STK511 tersebut nilai ujiannya lebih besar

atau sama dengan 80.5.

Misalnya diketahui persentil ke-70 dari nilai ujian

STK511 mahasiswa baru IPB adalah 80.5. Jelaskan

artinya !

Lihat Johnson , hlm. 40-4528

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Ragam (Variance)

Simpangan Baku (Standard Deviation)

Jangkauan (Range)

Jangkauan antar kuartil (Interquartile range)

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Lihat Johnson , hlm. 50-55

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Lihat Johnson (Example 17), hlm. 56

Min

Q1 Q2 Q3

Max

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Q1 = 4.4

Q2 = 9.4

Q3 = 17.5

(dari hasil sebelumnya)

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Apa interpretasi dari perbandingan 2 boxplot ini?

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Menu Graph untuk Tabel dan Grafik

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Menu Stat untuk Statistika Deskriptif

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Menu Stat untuk Statistika Deskriptif

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Johnson (Exercise : 2.1), hlm. 36

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Johnson (Exercise : 2.17), hlm. 38

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Kerjakan soal ini

melalui software

MINITAB

Johnson (Exercise : 2.22), hlm. 39

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Kerjakan soal ini

melalui software

MINITAB

Johnson (Exercise : 2.61), hlm. 57

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Kerjakan soal ini secara manual, kemudian dikerjakan pula

melalui software MINITAB. Bandingkan hasil manual dengan

output MINITAB.

Johnson (Exercise : 2.67), hlm. 57

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Kerjakan soal ini

melalui software

MINITAB

Johnson (Exercise : 2.84), hlm. 59

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Johnson, R.A. and Bhattacharyya, G.K. 2010.

Statistics, Principles and Methods 6th. John Wiley

& Sons, Inc., New York.

Montgomery, D.C. 2013. Design and Analysis of

Experiments 8th. John Wiley & Sons, Inc.,

Canada.

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kusmansadik.wordpress.com

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