Chapter 3 Surveys and Sampling.pdf - Chapter 3 Surveys and...

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3.1 -Three Ideas of Sampling Idea 1: Sample - Examine a Part of the Whole Population - An entire collection of individuals Sample - a smaller group of individuals Sample Survey - A list of question asked to a small group in hope of leaning something about the entire population Biased - The summary characteristics of a sample differ from the corresponding characteristics of the population it is trying to represent Idea 2: Randomize Sampling Error - Sample-to-sample differences Idea 3: The Sample Size is What Matters A Census - Does it Make Sense? Census - Sample of the entire population 3.2 - Population and Parameters Parameter - Key numbers in models Population Parameter - Parameter used in population models Statistic - Any summary found from data Sample Statistic - Statistics matched with parameters Representative - A sample will estimate the corresponding parameters accurately 3.3 - Common Sampling Designs Simple Random Sample (SRS) Simple Random Sample (SRS) - A sampling method gives each

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