A previous section dealt with data having outlying values that are
correct, being a natural product of the variable's distribution. This
section tackles the problem of what to do about outlying values that
very well may not be correct. Data collection instruments occasionally
hiccough. Noise creeps into communication lines. Keyboard operators
may even make data entry errors. How serious are these problems?
How can we detect them? How can we correct them? Detailed
answers to these questions must be found in appropriate statistics and
data analysis textbooks. This section will briefly review aspects of the
problem whic
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