The electric light bulbs of manufacturer A have a mean lifetime of 1400 hours, with a standard deviation of 200 hours. While electric light bulbs from manufacturer B have a mean lifetime of 1200 hours, with a standard deviation of 100 hours. If random samples of 150 bulbs of each brand are tested, find: c) 95% confidence limits for the difference of mean lifetimes of the populaaons of brand A and brand B? d) 99% confidence limits for the difference of mean lifetimes of the populations of brand A and brand B?

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
icon
Related questions
Question
The electric light bulbs of manufacturer A have a mean lifetime of 1400 hours, with a standard
deviation of 200 hours. While electric light bulbs from manufacturer B have a mean lifetime of
1200 hours, with a standard deviation of 100 hours. If random samples of 150 bulbs of each
brand are tested, find:
c) 95% confidence limits for the difference of mean lifetimes of the populaaons of brand A
and brand B?
d) 99% confidence limits for the difference of mean lifetimes of the populations of brand A
and brand B?
Transcribed Image Text:The electric light bulbs of manufacturer A have a mean lifetime of 1400 hours, with a standard deviation of 200 hours. While electric light bulbs from manufacturer B have a mean lifetime of 1200 hours, with a standard deviation of 100 hours. If random samples of 150 bulbs of each brand are tested, find: c) 95% confidence limits for the difference of mean lifetimes of the populaaons of brand A and brand B? d) 99% confidence limits for the difference of mean lifetimes of the populations of brand A and brand B?
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps with 2 images

Blurred answer
Similar questions
Recommended textbooks for you
MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
Statistics
ISBN:
9781119256830
Author:
Amos Gilat
Publisher:
John Wiley & Sons Inc
Probability and Statistics for Engineering and th…
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 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…
Elementary Statistics: Picturing the World (7th E…
Statistics
ISBN:
9780134683416
Author:
Ron Larson, Betsy Farber
Publisher:
PEARSON
The Basic Practice of Statistics
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
Introduction to the Practice of Statistics
Statistics
ISBN:
9781319013387
Author:
David S. Moore, George P. McCabe, Bruce A. Craig
Publisher:
W. H. Freeman