a self-serve emissions inspection facility, drivers plug a cable into their car’s OBDII port. The kiosk reads emissions information from the car’s computer. Drivers follow on-screen instructions to complete the inspection and get their report. The standard deviation of inspection time has been 7.5 minutes. The facility recently redesigned the on-screen instructions to make them easier to follow and they want to check if this has reduced the standard deviation of inspection time. A random sample of 40 drivers showed a sample standard of inspection time to be 5.8 m
a self-serve emissions inspection facility, drivers plug a cable into their car’s OBDII port. The kiosk reads emissions information from the car’s computer. Drivers follow on-screen instructions to complete the inspection and get their report. The standard deviation of inspection time has been 7.5 minutes. The facility recently redesigned the on-screen instructions to make them easier to follow and they want to check if this has reduced the standard deviation of inspection time. A random sample of 40 drivers showed a sample standard of inspection time to be 5.8 m
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
At a self-serve emissions inspection facility, drivers plug a cable into their car’s OBDII port. The kiosk reads emissions information from the car’s computer. Drivers follow on-screen
instructions to complete the inspection and get their report. The standard deviation of inspection
time has been 7.5 minutes. The facility recently redesigned the on-screen instructions to make
them easier to follow and they want to check if this has reduced the standard deviation of
inspection time. A random sample of 40 drivers showed a sample standard of inspection time to
be 5.8 minutes. At a 5% level of significance can we conclude that the redesign has reduced the
standard deviation of inspection times? What is your conclusion at 1% significance? What is the
population for which inferencing is being done?
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 6 steps with 1 images
Follow-up Questions
Read through expert solutions to related follow-up questions below.
Follow-up Question
why you didnot calculate the right tail? why we dont have CHIDIST(23.324,39)?
Solution
by Bartleby ExpertRecommended 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