10_11+Sampling+3+-+Ch7

# 10_11+Sampling+3+-+Ch7 - Sociology SYA4300 Professor Rob...

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1 Sociology SYA4300 Professor Rob White Tuesday (10/11) Sampling Methods (Part 2) 1 ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ 2 Probability Sampling 1. Simple random sampling 2. Systematic sampling 3. Stratified sampling 4. Multistage cluster sampling ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ 3 Probability Sampling The primary contribution of probability sampling: If… all elements of a population have an equal chance of being in the sample, then… the sample will be representative of the population from which it was selected. In other words… every possible combination of cases has an equal chance of being included in the sample. ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________

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2 4 1. Simple Random Sampling Example #1: The population has N=4 cases: 1,2,3,4 There are 6 possible samples of size n=2: (1,2) (1,3) (1,4) (2,3) (2,4) (3,4) Each sample has an equal chance of selection. ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ 5 1. Simple Random Sampling Example #2: The population has N=10 cases: people with differing amounts of money in their pocket, ranging from \$0 to \$9. Imagine all the possible samples of sample size n=1. There are 10 possible samples of size 1: (8) (1) (7) (0) (2) (6) (4) (9) (3) (5) Each sample has an equal chance of selection. ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ 6 1. Simple Random Sampling ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________
3 7 1. Simple Random Sampling Example #2: Imagine all the possible samples of sample size n=2. There are 45 possible samples of size 2:

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10_11+Sampling+3+-+Ch7 - Sociology SYA4300 Professor Rob...

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