SOLUTION: A study found that 73% of elementary students buy lunch at school at least once a month. How large a sample would be necessary to estimate the true proportion within 3 percentage p
Algebra.Com
Question 1161499: A study found that 73% of elementary students buy lunch at school at least once a month. How large a sample would be necessary to estimate the true proportion within 3 percentage points with 95% confidence?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
then half-interval or margin of error is 0.03=z*sqrt(p*(1-p)/n)
0.03=1.96*sqrt(0.73*0.27)/n)
square both sides
0.0009=3.8416*0.73*0.27/n
n=841.31 or 842
RELATED QUESTIONS
a recent survey determined that 7 out of 9 students eat school lunch at least once a... (answered by ewatrrr)
A recent national study found that the average high school’s student rented 6.3 videos... (answered by pw2638)
A survey group of 6 students are chosen at random from 25 elementary students and 13... (answered by Boreal)
30% of the students in a local elementary school bring their lunch from home. the school... (answered by hamsanash1981@gmail.com)
At a middle school, 24% of the students buy lunch in the cafeteria. About what fraction... (answered by fractalier)
An elementary school has n classes with 20 students each. In how many
ways can the... (answered by )
Two out of three of 450 students said they watch a movie at least once each month. Write... (answered by stanbon)
The Northwood School Math Club is having a tamale sale. The school has 1600 students,... (answered by Boreal,Theo)
A recent study claimed that is more than 35% of junior high students are overweight. In a
(answered by Boreal)