Observational Studies, Experiments, and Simple Random Sampling

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Presentation transcript:

Observational Studies, Experiments, and Simple Random Sampling Lesson 1 - 3 Observational Studies, Experiments, and Simple Random Sampling

Objectives Obtain a stratified sample Obtain a systematic sample Obtain a cluster sample

Vocabulary Stratified sample – separating the population into nonoverlapping groups strata and then obtaining a simple random sample from each stratum. Each stratum should be homogeneous (or similar) in some way. Systematic sample – selecting every kth individual from the population; first selected individual is randomly selected from individuals 1 through k Cluster sample – selecting all individuals within a randomly selected collection or group Convenience sample – sample in which data is easily obtained

Four sources of data Census Existing sources Survey sampling Designed experiments

Four basic sampling techniques Simple random sampling (SRS) Stratified sampling Some of all Cluster sampling All of some Systematic sampling

Summary and Homework Summary Homework Stratified and cluster sampling are different Convenience sampling results are generally suspect Homework pg 30-32: 9-21 (odd only), 27, 30