Chapter_04

# Chapter_04 - Chapter 4 Topics 1 Research Strategies Sample...

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Chapter 4 Topics 1. Research Strategies - Sample Surveys - Randomized Experiments - Observational Studies - Meta Analysis (ch 25) 2. Terminology - Population: The big group to whom you want to research. E.g. all PSU undergraduates, all residents of PA. - Sample: a subgroup of that population - Sampling Frame: the group from which the sample is take, preferably this is the population - Sample proportion: the number in the group of interest divided by the total number in the sample. E.g. from a sample of 1000 PSU students, 400 say that JoePa should retire. The sample proportion would be 0.40 or 40%. - Census: a measurement done on the entire population 3. Probability-based sampling methods - Simple random sample: a sample is randomly drawn from the population/sampling frame. Each subject in the population has a equal chance of being selected. - Stratified random sampling: the population/sampling frame is partitioned into some strata or specific groups based on some criteria. E.g. if sampling from all PSU undergraduates we could divide this population into strata such as Freshmen,

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Chapter_04 - Chapter 4 Topics 1 Research Strategies Sample...

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