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Fundamentals of Statistics | 4th Edition | ISBN: 9780321838704 | Authors: Michael Sullivan,III
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High-Speed Internet Access A researcher wishes to estimate

Chapter 5, Problem 33AYU

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QUESTION:

Problem 33AYU

High-Speed Internet Access A researcher wishes to estimate the proportion of households that have broadband Internet access. What size sample should be obtained if she wishes the estimate to be within 0.03 with 99% confidence if

(a) she uses a 2009 estimate of 0.635 obtained from the National Telecommunications and Information Administration?

(b) she does not use any prior estimates?

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QUESTION:

Problem 33AYU

High-Speed Internet Access A researcher wishes to estimate the proportion of households that have broadband Internet access. What size sample should be obtained if she wishes the estimate to be within 0.03 with 99% confidence if

(a) she uses a 2009 estimate of 0.635 obtained from the National Telecommunications and Information Administration?

(b) she does not use any prior estimates?

ANSWER:

Problem 33AYU

Answer:

Step1:

We have E = 0.03 with 99% confidence,

a). she uses a 2009 estimate of 0.635 obtained from the National Telecommunications and Information Administration Sample size can be calculated by using the formula  

n =

   = 2.578(from standard normal table)

Confidence Level

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