III EJerdse.\ Ilhrol/gh 14 . . \"O/re each gil'ell lillear ~)'~'Ielll by fhe It1nl/Od of dimillmivil.3x + 2y + : = 24x + 2y + 2: = 8x - y + : =4
7 CHAPTER 2: SAMPLES, GOOD AND BAD Goal - Gain informationabout the whole byexamining only apart don't haveto eat thewhole oxto know thatthe meat is tough." "You Samuel Johnson K"y Ideas 1.Why we needto sample 2. Why iscarefulesign soimportant .-, J. Bias Examples 'OplilriCi'ril5-lry {C sfin)c\.le {he opioion cF {l'leel'ltlre {r1 v\/0 SrtrCtil Sc{mpte -r 'PfeSiCleolrot 0pprovql t&\\nqs "qt(eHcin(f sornpiing-.thr cgucliry c{ F,oierr.,eS 'how mO,ny peopre u.tqtch tlle supey bctut -C\dltr{iSers r,.\Sn.\0KnOru "\opG\ in Cfclfr J0 Ko0r-r: hcr..rulnuch 7 Ttt'rniIlr,'logy 1. Population entire group of objectsabout which information is - wanted 2.Ilnit any individual member of the population it[,\: \\(- Ii.r,\rl .,,i,\(t i',-4* 3.Sample'j u:atsubset of the populAiion used to gain information about the whole list from which the sample ischosen 4.Sampling frame - of unitg 5.Variable-- a characteristicof a unit,to be measured for u