Unformatted text preview: Student: Grady Simonton Course: Mathll9: Elementary Statistics - Spring 2.010 - CRN: 49239
Instructor: Shawn Parvini - 16 weeks Date: 2/18/10 Book: Triola: Elementary Statistics, lle
Time: 10:56 ANI Identify the type of sampling used (random, systematic, convenience, stratiﬁed, or cluster sampling) in the situation
described below. A man experienced a tax audit. The tax department claimed that the man was audited because he was one of 200
taxpayers randomly selected to be audited that month. In a random sample, members from the population are selected in such a way that each individual member in the
population has an equal chance of being selected. In systematic sampling, the researchers select some starting point and then select every kth (such as every 50th) element
in the population. With convenience sampling, the researchers simply use results that are very easy to get.
With stratiﬁed sampling, the researchers subdivide the population into at least two different subgroups (or strata) so that
subjects within the same subgroup share the same characteristics (such as gender or age bracket), then they draw a sample from each subgroup (or stratum). In cluster sampling, the researchers ﬁrst divide the population area into sections (or clusters), then randomly select some
of those clusters, and then choose all the members from those selected clusters. Notice that every taxpayer had an equal chance of being selected to be one of the 200 audited that month. Since every taxpayer had an equal chance of being selected, the tax department used a random sampling. Page 1 ...
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- Spring '10