SOLUTION: In a survey, 376 out of 1,078 US adults said they drink at least 4 cups of coffee a day. Find a point estimate (P) for the population proportion of US adults who drink at least 4 c

Question 1159756: In a survey, 376 out of 1,078 US adults said they drink at least 4 cups of coffee a day. Find a point estimate (P) for the population proportion of US adults who drink at least 4 cups of coffee a day, then construct a 99% confidence interval for the proportion of adults who drink at least 4 cups of coffee a day.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
Point estimate is just the proportion given or 376/1078=0.3488
99% CI is half-interval is z(0.995)* SE, or 2.576* sqrt (0.3488*0.6512/1078)
=0.0374
add and subtract that to mean
99% CI is (0.3114, 0.3862)
RELATED QUESTIONS
In a survey, 498 out of 1,397 US adults said they drink at least 4 cups of coffee a day.... (answered by Boreal)

in a gallup poll, 1025 randomly selected adults were surveyed and 29% of them said that... (answered by ewatrrr)

Assume all samples are simple random samples. In a poll, 1025 randomly selected adults... (answered by Boreal)

Statistics. The average person drinks about 3 1/5 cups of coffee per day. If a person... (answered by ewatrrr)

1. Among cofee drinkers, men drink of 3.2 cups per day with a standard deviation of 0.8... (answered by stanbon)

Approximately 70% of U.S. adults had at least one pet as a child. We randomly survey 60... (answered by stanbon)

1. Customers are asked to take a survey. Out of a random sample of 340 customers, 290... (answered by ewatrrr)

A coffee shop currently sells 300 lattes a day at $3.50 each. They recently tried raising (answered by Boreal)

People living in Fairbanks drink 3600 cups of hot chocolate per day when the temperature... (answered by KMST)