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A researcher wishes to estimate, with 99% confidence, the population proportion of motor vehicle fatalities that were caused by alcohol-impaired driving. His estimate must be
A researcher wishes to estimate, with
99%
confidence, the population proportion of motor vehicle fatalities that were caused by alcohol-impaired driving. His estimate must be accurate within
4%
of the population proportion.(a) No preliminary estimate is available. Find the minimum sample size needed.(b) Find the minimum sample size needed, using a prior study that found that
28%
of motor vehicle fatalities that were caused by alcohol-impaired
driving.
(c) Compare the results from parts (a) and
(b).
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