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

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

© 2002 Prentice-Hall, Inc. Chap 3-2 Topik Ukuran Pemusatan Mean, median, mode, geometric mean, midrange Quartile Ukuran Keragaman Range, interquartile range, variance and standard deviation, coefficient of variation Shape Symmetric, skewed, using box-and-whisker plots

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

© 2002 Prentice-Hall, Inc. Chap 3-4 Pengukuran Pemusatan Central Tendency Rata- rata MedianMode Geometric Mean

© 2002 Prentice-Hall, Inc. Chap 3-5 Rata-rata (Mean) Nilai rata-rata aritmatik Sample mean Population mean Sample Size Population Size

© 2002 Prentice-Hall, Inc. Chap 3-6 Ukuran pemusatan yang paling sering digunakan Dipengaruhi oleh nilai ekstrem (continued) 0 1 2 3 4 5 6 7 8 9 100 1 2 3 4 5 6 7 8 9 10 12 14 Mean = 5Mean = 6

© 2002 Prentice-Hall, Inc. Chap 3-7 Median Tidak dipengaruhi oleh nilai ekstrem Dalam posisi terurut, median terletak ditengah If n or N is odd, the median is the middle number If n or N is even, the median is the average of the two middle numbers 0 1 2 3 4 5 6 7 8 9 100 1 2 3 4 5 6 7 8 9 10 12 14 Median = 5

© 2002 Prentice-Hall, Inc. Chap 3-8 Modus (Mode) Nilai yang sering muncul Tidak dipengaruhi oleh nilai ekstrem Digunakan pada data numeric atau categoric Mungkin saja tidak terdapat modus Atau ada beberapa modus 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Mode = 9 0 1 2 3 4 5 6 No Mode

© 2002 Prentice-Hall, Inc. Chap 3-9 Rata-rataGeometric Useful in the measure of rate of change of a variable over time Geometric mean rate of return Measures the status of an investment over time

© 2002 Prentice-Hall, Inc. Chap 3-10 Contoh An investment of \$100,000 declined to \$50,000 at the end of year one and rebounded to \$100,000 at end of year two:

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