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Eliminating symptoms of allergies in animal studies

An experimental drug has been shown to be 75% effective in eliminating symptoms of allergies in animal studies. A small human study involving 6 participants is conducted. What is the probability that the drug is effective on more than half of the participants?

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## Q : Estimate for population proportion

Airline managers expect that only about 15% will say "yes." Based on this assumption, what size sample should the airline take if it wants to develop a 95% confidence interval estimate for the population proportion who will say "yes" with a margin