exercise01

exercise01 - ECON 41 St tisti s for E onomi s Sumer 07...

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Unformatted text preview: ECON 41 St tisti s for E onomi s Sumer 07 Chunming Yu n Exer ise 3.14 (Textbok P.84) T e fo owing data give t e 2004 prots (in mi ion of do ars) of t e nine computer and oce equipment companies inc uded in t e Fortune 1000 ( Fortune, Apri 18,2005). T e data, entered in t at order, are for internationa Busines mac ine, ew et Packard, De , Xerox, Sun Microsystems, Ap e Computer, NCR, Pitney Bowes, and Gateway. 8430 ; 3497 ; 3043 ; 859 ; 38 ; 27 ; 290 ; 481 ; 5 8 Find t e mean and median for t ese data. Do t ese data ave a mode? ( Answer ) Note t at N = 9 : Ranking in increasing order, 5 8 ; 38 ; 27 ; 290 ; 481 |{z} mid e ; 857 ; 3043 ; 3497 ; 8430 : T e median is t e mid e term 481 mi ion : T e mean is = P x N = 5 8) + 38) + 27 + 290 + 481 + 857 + 3043 + 3497 + 8430 9 = 15918 9 = 17 8 : 7 mi ion T ere is no mode in t is data because eac va ue of data set is dierent. Exer ise 3.28 (Textbok P.85) T e mean 2005 income for ve fami ies was $79,520. W at was t e tota 2005 income of t ese ve fami ies? (Answer) We ave x = 79 ; 520 $) and n = 5 : T e mean is ca cu ated by x = P x n : So we ave (mu tip ying n bot sides) n x = P x or P x = n x; w ere P x is W at was t e tota 2005 income of t ese ve fami ies T erefore we ave P x = n x = 5 79 ; 520 = 397 ; ($) Exer ise 3.45 (Textbok P.92) T e fo owing data give t e numbers of car t efts t at ocured in a city in t e past 12 days. ; 3 ; 7 ; 1 ; 4 ; 3 ; 8 ; 7 ; 2 ; ; 9 ; 15 Ca cu ate range, variance, and standard deviation....
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exercise01 - ECON 41 St tisti s for E onomi s Sumer 07...

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