Problem 5 Lightbulbs of a certain type are advertised as having an average lifetime of 750 hours. The price of these bulbs is very favourable, so a potential customer has decided to go ahead with a purchase arrangement unless it can be conclusively demonstrated that the trne average lifetime is smaller than what is advertised. A random sample of 43 bulbs was selected and it gives an average of 738.44 hours, with standard deviation 38.20 hours. a) Does the data provide evidence for concluding that the true average lifetime of the bulbs is less than 750 hours? Carry out a test of hypotheses using aO 02 confidence level.
Problem 5 Lightbulbs of a certain type are advertised as having an average lifetime of 750 hours. The price of these bulbs is very favourable, so a potential customer has decided to go ahead with a purchase arrangement unless it can be conclusively demonstrated that the trne average lifetime is smaller than what is advertised. A random sample of 43 bulbs was selected and it gives an average of 738.44 hours, with standard deviation 38.20 hours. a) Does the data provide evidence for concluding that the true average lifetime of the bulbs is less than 750 hours? Carry out a test of hypotheses using aO 02 confidence level.
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

Transcribed Image Text:Problem 5
Lightbulbs of a certain type are advertised as having an average lifetime of 750 hours. The price
of these bulbs is very favourable, so a potential customer has decided to go ahead with a purchase
arrangement unless it can be conclusively demonstrated that the trne average lifetime is smaller
than what is advertised. A random sample of 43 bulbs was selected and it gives an average of 738.44
hours, with standard deviation 38.20 hours.
a) Does the data provide evidence for concluding that the true average lifetime of the bulbs is less
than 750 hours? Carry out a test of hypotheses using a a02 confidence level.
b) Calculate a upper confidence bound using a confidence level of 98% for the average lifetime for
such certain type of bulbs.
c) Is the result achieved in part b) supporting the one obtained in part a)? Explain,
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 2 steps

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