Answered: than one percentage point? (a) Assume… | bartleby

Algebra & Trigonometry with Analytic Geometry

Algebra & Trigonometry with Analytic Geometry

13th Edition

ISBN:9781133382119

Author:Swokowski

Publisher:Swokowski

Chapter10: Sequences, Series, And Probability

Section10.8: Probability

Problem 32E

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4. You plan to develop a new software system that you believe will surpass the success of
Google and Facebook combined. In planning for the operating system that you will use,
you need to estimate the percentage of computers that use Windows. How many computers
must be surveyed in order to be 99% confident that your estimate is in error by no more
than one percentage point?
(a) Assume that nothing is known about the percentage of computers with Windows
operating systems.
(b) Assume that a recent survey suggests that about 90% of computers use Windows
operating systems (based on data from Net Applications).
(c) Does the additional survey information from part (b) have much of an effect on the
sample size that is required?
5. A bath soap manufacturing process is designed to produce a mean of 120 bars of soap per
mple of 11 batches show the following numbers of bars of soap:

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