Chap2_3 - Bad Sampling Plans Biased design Systematically...

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1 Chapter 2 Samples, Good and Bad Bad Sampling Plans • Biased design : Systematically favors certain outcomes. (p. 20) • Sampling designs that are often biased: • ________________sample: Selects whichever individuals are easiest to reach. (p. 20) • Example:__________________________ __________________________________ More Bad Ideas • _________________Sample: Chooses itself by responding to a general appeal. (p. 20) • Examples: __________________________ Pick a Number Results • Did you pick 1, if so ____% also selected this number. • Did you pick 2% or 4%, if so _____% also selected this number. • Did you pick 3, if so ____% also selected this number. It Is Not Easy Being Random • Using either _____________sampling, or a ____________________sample, or even using your own personal choice introduces bias into your design. • If data is not collected properly the information is not helpful to a researcher.
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2 How to Chose a Random Sample • It is much more difficult to select a group at random. We will look at four good ways to select data. They are • ___________________ • ___________________ • ___________________ • ___________________ A Simple Random Sample (SRS) of size n • Consists of n individuals from the population chosen in such a way that every set of n individuals has the same chance of being selected.
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Chap2_3 - Bad Sampling Plans Biased design Systematically...

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