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# Initial survey results indicate that sequals = 17.4 books.

i need help with Part "C" 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

205

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

﻿

​(c) What effect does doubling the required accuracy have on the sample​ size?

A.

Doubling the required accuracy nearly quarters the sample size.

B.

Doubling the required accuracy nearly quadruples the sample size.

C.

Doubling the required accuracy nearly doubles the sample size.

D.

Doubling the required accuracy nearly halves the sample size.

Part "C" since 205 / 52 = 3.94 which is almost... View the full answer

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