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A medical researcher reading an article in a journal observed that the stated proportion of US...

A medical researcher reading an article in a journal observed that the stated proportion of US adults that ate breakfast every morning is 55%. The researcher took a random sample of 250 U.S. adults, and found that 56.4% say that they eat breakfast every day.

a.) construct a 99% C.I. for the proportion of adults who eat breakfast

b.) using the study above, how many adults need to be sampled with 95% confidence and an error of 3%?

c.) If no prior study was conducted, how many adults would need sampling using the information from part b?

Math   Statistics-And-Probability   
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