Practice question #5: The U.S. Bureau of Transportation Statistics reported in 2015 that .72 of all domestic passenger flights arrived within 15 minutes of the scheduled arrival time. We would like to come up with a confidence interval for the proportion of flights this year that arrived within 15 minutes of the scheduled arrival time with a margin of error of .04 (for a 95% confidence interval). Find the sample size necessary for this using 0.72 as a preliminary estimate for p. Write formula. Round answer appropriately. Repeat using the conservative value of 0.5 for p. Why is it safer to use the sample size calculated in part B rather than part A?
Practice question #5: The U.S. Bureau of Transportation Statistics reported in 2015 that .72 of all domestic passenger flights arrived within 15 minutes of the scheduled arrival time. We would like to come up with a confidence interval for the proportion of flights this year that arrived within 15 minutes of the scheduled arrival time with a margin of error of .04 (for a 95% confidence interval). Find the sample size necessary for this using 0.72 as a preliminary estimate for p. Write formula. Round answer appropriately. Repeat using the conservative value of 0.5 for p. Why is it safer to use the sample size calculated in part B rather than part A?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
Practice question #5: The U.S. Bureau of Transportation Statistics reported in 2015 that .72 of all domestic passenger flights arrived within 15 minutes of the scheduled arrival time. We would like to come up with a confidence interval for the proportion of flights this year that arrived within 15 minutes of the scheduled arrival time with a margin of error of .04 (for a 95% confidence interval).
-
Find the
sample size necessary for this using 0.72 as a preliminary estimate for p. Write formula. Round answer appropriately. -
Repeat using the conservative value of 0.5 for p.
-
Why is it safer to use the sample size calculated in part B rather than part A?
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 6 steps with 4 images
Recommended textbooks for you
MATLAB: An Introduction with Applications
Statistics
ISBN:
9781119256830
Author:
Amos Gilat
Publisher:
John Wiley & Sons Inc
Probability and Statistics for Engineering and th…
Statistics
ISBN:
9781305251809
Author:
Jay L. Devore
Publisher:
Cengage Learning
Statistics for The Behavioral Sciences (MindTap C…
Statistics
ISBN:
9781305504912
Author:
Frederick J Gravetter, Larry B. Wallnau
Publisher:
Cengage Learning
MATLAB: An Introduction with Applications
Statistics
ISBN:
9781119256830
Author:
Amos Gilat
Publisher:
John Wiley & Sons Inc
Probability and Statistics for Engineering and th…
Statistics
ISBN:
9781305251809
Author:
Jay L. Devore
Publisher:
Cengage Learning
Statistics for The Behavioral Sciences (MindTap C…
Statistics
ISBN:
9781305504912
Author:
Frederick J Gravetter, Larry B. Wallnau
Publisher:
Cengage Learning
Elementary Statistics: Picturing the World (7th E…
Statistics
ISBN:
9780134683416
Author:
Ron Larson, Betsy Farber
Publisher:
PEARSON
The Basic Practice of Statistics
Statistics
ISBN:
9781319042578
Author:
David S. Moore, William I. Notz, Michael A. Fligner
Publisher:
W. H. Freeman
Introduction to the Practice of Statistics
Statistics
ISBN:
9781319013387
Author:
David S. Moore, George P. McCabe, Bruce A. Craig
Publisher:
W. H. Freeman