Handout_3_2_fall11(1 - 3.2 Sampling Design population the entire group of individuals we want information about sample the part of the population

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3.2 Sampling Design population - the entire group of individuals we want information about sample - the part of the population that we actually examine in order to gather information sample survey - survey a sample to gain info about the population voluntary response sample - consists of people who choose themselves by responding to a general appeal (EX- online polls) Voluntary response samples are biased because people with strong opinions, especially negative opinions, are most likely to respond. simple random sample (SRS) - SRS of size n consists of n individuals from the population chosen in such a way that every set of n individuals has an equal chance to be the sample actually selected •SRS- gives each individual an equal chance to be chosen •SRS- gives every possible sample of size n an equal chance to be chosen systematic random sample •systematic- gives each individual an equal chance to be chosen •systematic- not give every possible sample of size n an equal chance to be chosen
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This note was uploaded on 10/13/2011 for the course PAM 2100 at Cornell University (Engineering School).

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Handout_3_2_fall11(1 - 3.2 Sampling Design population the entire group of individuals we want information about sample the part of the population

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