2-3-11 - (2.3.11) Types of Probability Sampling Simple...

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(2.3.11) Types of Probability Sampling Simple Random sampling Systematic sampling Stratified sampling Cluster sampling Simple Random Sampling SRS o Everyone has an equal chance of being selected Use a table of random numbers (p.149) or computer generated random numbers i.e. Name drawn out of hat, random digit dialing (RDD) Systematic Sampling Starting point selected randomly Every nth number on the list selected o I.e. population: 100, sample needed: 20, sampling interval: 100/20 = 5 so every 5 th person is selected Stratified Sampling To get adequate representation of different groups in a population o Stratum: a segment of population having one or more common characteristic (i.e: age, gender, religion, income level, etc) Strata: similar within and different between o Each stratum treated as a seperate subpopulation o Proportionate: based on proportions of the population o Disproportionate: oversample or over-represent a particular stratum o Random sample
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This note was uploaded on 02/14/2011 for the course ADPR 3130 taught by Professor Lee during the Spring '11 term at UGA.

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2-3-11 - (2.3.11) Types of Probability Sampling Simple...

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