A certain forum reported that in a survey of 2004 American adults, 21% said they believed in astrology. (a) Calculate a confidence interval at the 99% confidence level for the proportion of all adult Americans who believe in astrology. (Round your answers to three decimal places.) 0.187 ✔0.233 Interpret the resulting interval. O We are 99% confident that the true population mean lies below this interval. We are 99% confident that this interval contains the true population mean. O We are 99% confident that this interval does not contain the true population mean. O We are 99% confident that the true population mean lies above this interval. (b) What sample size would 686 x required for the width of a 99% CI to be at most 0.05 irrespective of the value of p? (Round your answer up to the nearest integer.) You may need to use the appropriate table in the Appendix of Tables to answer this question.
A certain forum reported that in a survey of 2004 American adults, 21% said they believed in astrology. (a) Calculate a confidence interval at the 99% confidence level for the proportion of all adult Americans who believe in astrology. (Round your answers to three decimal places.) 0.187 ✔0.233 Interpret the resulting interval. O We are 99% confident that the true population mean lies below this interval. We are 99% confident that this interval contains the true population mean. O We are 99% confident that this interval does not contain the true population mean. O We are 99% confident that the true population mean lies above this interval. (b) What sample size would 686 x required for the width of a 99% CI to be at most 0.05 irrespective of the value of p? (Round your answer up to the nearest integer.) You may need to use the appropriate table in the Appendix of Tables to answer this question.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter4: Equations Of Linear Functions
Section4.5: Correlation And Causation
Problem 23PFA
Related questions
Question
only b
Transcribed Image Text:A certain forum reported that in a survey of 2004 American adults, 21% said they believed in astrology.
(a) Calculate a confidence interval at the 99% confidence level for the proportion of all adult Americans who believe in astrology. (Round your answers to three decimal places.)
0.187
"
0.233
Interpret the resulting interval.
O We are 99% confident that the true population mean lies below this interval.
● We are 99% confident that this interval contains the true population mean.
O We are 99% confident that this interval does not contain the true population mean.
O We are 99% confident that the true population mean lies above this interval.
(b) What sample size would be required for the width of a 99% CI to be at most 0.05 irrespective of the value of p? (Round your answer up to the nearest integer.)
686
X
You may need to use the appropriate table in the Appendix of Tables to answer this question.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images
Recommended textbooks for you
Glencoe Algebra 1, Student Edition, 9780079039897…
Algebra
ISBN:
9780079039897
Author:
Carter
Publisher:
McGraw Hill
Glencoe Algebra 1, Student Edition, 9780079039897…
Algebra
ISBN:
9780079039897
Author:
Carter
Publisher:
McGraw Hill