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This chapter presents the beginning of
inferential statistics.
 The two major activities of inferential
statistics are (1) to use sample data to
estimate values of a population parameters,
and (2) to test hypotheses or claims made
about population parameters.
 We introduce methods for estimating values
of these important population parameters:
proportions, means, and variances.
 We also present methods for determining
sample sizes necessary to estimate those
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