Concept explainers
(a)
To construct the 95% confidence interval that would estimate the proportion of all adults who use internet is:
(a)
Explanation of Solution
Given information:
Where
And
Formula used:
The formula for 95% confidence interval for true difference in the population proportion
Where
Calculation:
For the given problem
The critical value of Z at 5% level of significance is
Therefore, from the formula the confidence interval will be,
Hence 95% confidence interval to estimate the true differences in the proportion of users and non-users who expect business to have Web sites is
(b)
To construct the 95% confidence interval that would estimate the true difference in the proportion of users and non-users who expect business to have Web sites:
(b)
Explanation of Solution
Given information:
Where
Also
Formula used:
The formula for 95% confidence interval for true difference in the population proportion
Where
Calculation:
For the given problem
The critical value of Z at 5% level of significance is
Therefore, from the formula the confidence interval will be,
Hence 95% confidence interval to estimate the true differences in the proportion of users and non-users who expect business to have Web sites is
Chapter 10 Solutions
The Practice of Statistics for AP - 4th Edition
Additional Math Textbook Solutions
Elementary Statistics: Picturing the World (7th Edition)
Introductory Statistics (2nd Edition)
Elementary Statistics Using Excel (6th Edition)
Statistics: The Art and Science of Learning from Data (4th Edition)
Elementary Statistics (13th Edition)
- MATLAB: An Introduction with ApplicationsStatisticsISBN:9781119256830Author:Amos GilatPublisher:John Wiley & Sons IncProbability and Statistics for Engineering and th...StatisticsISBN:9781305251809Author:Jay L. DevorePublisher:Cengage LearningStatistics for The Behavioral Sciences (MindTap C...StatisticsISBN:9781305504912Author:Frederick J Gravetter, Larry B. WallnauPublisher:Cengage Learning
- Elementary Statistics: Picturing the World (7th E...StatisticsISBN:9780134683416Author:Ron Larson, Betsy FarberPublisher:PEARSONThe Basic Practice of StatisticsStatisticsISBN:9781319042578Author:David S. Moore, William I. Notz, Michael A. FlignerPublisher:W. H. FreemanIntroduction to the Practice of StatisticsStatisticsISBN:9781319013387Author:David S. Moore, George P. McCabe, Bruce A. CraigPublisher:W. H. Freeman