07-20-12
Exercise
in confidence interval for proportion, variance and standard deviation
1.In
a recent survey of 150 households, 54 has central air conditioning. Find the p -hat and the q-hat, where p-hat is
the proportion of households that have centralized air conditioning.
2.
A sample of 500 nursing applicants included 60 from men. Find the 90%confidence interval of the true
proportion of men who applied to the nursing program.
3.
A survey of 200,000 boat owners found that 12% of the pleasure boats were named
serenity. Find the 95 % confidence
interval of the true proportion of boats named serenity.
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