© 2002 Prentice-Hall, Inc.Chap 3-1 Bab 3 Pengukuran

© 2002 Prentice-Hall, Inc. Chap 3-2 Pengukuran Central Tendency Mean Median Mode Quartile Geometric Mean Pengukuran Variation Variance Standard Deviation Coefficient of Variation Range

© 2002 Prentice-Hall, Inc. Chap 3-3 Quartiles Split Ordered Data into 4 Quarters Position of i-th Quartile and Are Measures of Noncentral Location = Median, A Measure of Central Tendency 25% Data in Ordered Array:

© 2002 Prentice-Hall, Inc. Chap 3-4 Ukuran Keragaman Variation VarianceStandard DeviationCoefficient of Variation Population Variance Sample Variance Population Standard Deviation Sample Standard Deviation Range Interquartile Range

© 2002 Prentice-Hall, Inc. Chap 3-5 Range Measure of variation Beda nilai pengamatan yang tertinggi dan terendah Ignores the way in which data are distributed Range = = Range = = 5

© 2002 Prentice-Hall, Inc. Chap 3-6 Also known as midspread Spread in the middle 50% Difference between the first and third quartiles Not affected by extreme values Interquartile Range Data in Ordered Array:

© 2002 Prentice-Hall, Inc. Chap 3-7 Important measure of variation Shows variation about the mean Sample variance: Population variance: Variance

© 2002 Prentice-Hall, Inc. Chap 3-8 Standard Deviation Most important measure of variation Shows variation about the mean Has the same units as the original data Sample standard deviation: Population standard deviation:

© 2002 Prentice-Hall, Inc. Chap 3-9 Perbandingan Standar Deviasi Mean = 15.5 s = Data B Data A Mean = 15.5 s = Mean = 15.5 s = 4.57 Data C

© 2002 Prentice-Hall, Inc. Chap 3-10 Bentuk Distribusi Describes how data is distributed Measures of shape Symmetric or skewed Mean = Median =Mode Mean < Median < Mode Mode < Median < Mean Right-Skewed Left-SkewedSymmetric