Algebra and Trigonometry (MindTap Course List)
4th Edition
ISBN: 9781305071742
Author: James Stewart, Lothar Redlin, Saleem Watson
Publisher: Cengage Learning
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Chapter B, Problem 6E
To determine
The solution for the expression.
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A programmer plans to develop a new software system. In planning for the operating system that he will use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be
95%
confident that his estimate is in error by no more than
five
percentage
points?
Complete parts (a) through (c) below.
Question content area bottom
Part 1
a) Assume that nothing is known about the percentage of computers with new operating systems.
n=385385
(Round up to the nearest integer.)
Part 2
b) Assume that a recent survey suggests that about
86%
of computers use a new operating system.
n=enter your response here
(Round up to the nearest integer.)
A programmer plans to develop a new software system. In planning for the operating system that he will use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be
95%
confident that his estimate is in error by no more than
four
percentage
points?
Complete parts (a) through (c) below.
Question content area bottom
Part 1
a) Assume that nothing is known about the percentage of computers with new operating systems.
n=601601
(Round up to the nearest integer.)
Part 2
b) Assume that a recent survey suggests that about
91%
of computers use a new operating system.
n=enter your response here
(Round up to the nearest integer.)
Part 3
c) Does the additional survey information from part (b) have much of an effect on the sample size that is required?
A.
Yes, using the additional survey information from part (b) dramatically reduces the sample size.
B.
No, using the…
An epidemiologist plans to conduct a survey to estimate the percentage of women who give birth. How many women must be surveyed in order to be
99%
confident that the estimated percentage is in error by no more than
two
percentage
points?
Complete parts (a) through (c) below.
Question content area bottom
Part 1
a. Assume that nothing is known about the percentage to be estimated.
n=enter your response here
(Round up to the nearest integer.)
Part 2
b. Assume that a prior study conducted by an organization showed that
81%
of women give birth.
n=enter your response here
(Round up to the nearest integer.)
Part 3
c. What is wrong with surveying randomly selected adult women?
A.
Randomly selecting adult women would result in an overestimate, because some women will give birth to their first child after the survey was conducted. It will be important to survey women who have completed the time during which they can give birth.
B.
Randomly…
Chapter B Solutions
Algebra and Trigonometry (MindTap Course List)
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