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# People were polled on how many books they read the previous year. Initial survey results indicate that sequals = 17.4 books.

i need help with part "B" below, please.

﻿People were polled on how many books they read the previous year. Initial survey results indicate that sequals

=17.4

17.4 books. Complete parts ​(a) through ​(d) below.

​(a) How many subjects are needed to estimate the mean number of books read the previous year within four

four books with 90

90​% ​confidence?

This 90 %

90% confidence level requires

52

52 subjects. ​(Round up to the nearest​ subject.)

​(b) How many subjects are needed to estimate the mean number of books read the previous year within two

two books with 90

90​% ​confidence?

This 90 %

90% confidence level requires

nothing

subjects. ​(Round up to the nearest​ subject.)

part "B n ≥ ( Zc*σ / E ) 2 =( 1.645*17.4... View the full answer

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