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Unformatted text preview: Chapter 2 Samples Good and Bad 1.Write down exactly what constitutes a a. Simple Random Sample (SRS) Any amount of individuals from a population chosen in such a way that every set of any amount of individuals has an equal chance to be the sample that is actually selected. a. A Convenience sample The selection of which ever individuals is easiest to reach. • Often biased a. A Voluntary sample Chooses itself by responding to a general appeal. • Often biased 1.Write down what you think constitutes a random sequence of twenty ‘heads’ and ‘tails’ It is deliberate use of chance, thus avoiding bias due to personal choice. 1.What does it mean to say a sample is ‘biased’? If the design of the statistical study systematically favors certain outcomes. 1.Give an example of a bad sampling method to be avoided. A voluntary response sample...
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This note was uploaded on 02/11/2010 for the course STAT 113 taught by Professor Mr.deely during the Spring '10 term at Purdue University Calumet.
- Spring '10