by Jenn Handler
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Collection of procedures and principles for gathering data and analyzing information to help people make decisions.
A statistically significant finding does not always have
practical importance. The implied direction of cause and
effect may be wrong. Any study should be viewed in
the context of society at the time it was done.
Simple Summaries are
easier then long lists.
Upper & Lower Quartiles
Always include the base rate or baseline
risk when discussion a change in the rate
or risk of something.
A Sample of a few hundred, or a few
thousand can give reasonably accurate
information about a population of many
Margin of Error
An unrepresentative sample, no matter
how big, tells you almost nothing about
Cause-and-Effect conlusions cannot
generally be made on the basis of an
Unlike Observational studies, cause-and-effect
conclusions can generally be made on the basis
of randomized experiments.
Statistically Significant and