Answered: People were polled on how many books…

Name: People were polled on how many books they read the previous year. How
Uploaded: 2024-03-20T07:07:00.000Z
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Description: 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 99% confidence? Initial survey results indicate that σ=18.8 books. A 99% conf

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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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 99% confidence? Initial survey results indicate that σ=18.8 books.

A 99% confidence level requires ______ subjects.

(Round up to the nearest whole number as needed.)

Expert Solution

Step 1

Given

σ=18.8 , E = 1 ,

$(1 - α) 100 % = 99 %$

$α = 0.01$

$Z_{\frac{α}{2}} = 2.58 (U s e E x c e l f u n c t i o n = N O R M S I N V (0.005))$

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