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Lesson 1 - 2

Lesson 1 - 2. Observational Studies, Experiments, and Simple Random Sampling. Objectives. Distinguish between an observational study and an experiment Obtain a simple random sample. Vocabulary. Census – list of all individuals in a population along with certain characteristics

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Lesson 1 - 2

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  1. Lesson 1 - 2 Observational Studies, Experiments, and Simple Random Sampling

  2. Objectives • Distinguish between an observational study and an experiment • Obtain a simple random sample

  3. Vocabulary • Census – list of all individuals in a population along with certain characteristics • Frame – a list of all individuals in a population • Observational Study – measures the characteristics of a population by studying individuals in a sample; but does not try to influence the variable(s) of interest • Designed Experiment – applies a treatment to individuals (experimental units or subjects) and attempts to isolate the effects of the treatment on a response variable • Lurking variables – variables not identified in the study, but may be effecting the response variable • Simple random sample – every possible sample of size n has an equally likely chance of being selected from a population of size N

  4. Four sources of data • Census • Existing sources • Survey sampling • Designed experiments

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

  6. Summary and Homework • Summary • Homework • pg 19 – 21; 9-18, 20, 21

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