SOLUTION: People were polled on how many books they read the previous year. How many subjects are needed to estimate the number of books read the previous year within one book with 95​
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Question 1120954: People were polled on how many books they read the previous year. How many subjects are needed to estimate the number of books read the previous year within one book with 95% confidence? Initial survey results indicate that sigmaequals 13.8 books.
A 95 % confidence level requires _____ subjects. Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! sigma means we can use z and +/- 1.96.
the SE is z*sigma/sqrt(n), and that equals 1 book, the error.
1.96*13.8/sqrt(n)=1
square both sides and multiply everything by n
3.8416*190.44=1
n=731.59 or 732 subjects
