to build a 95% confidence interval for the population mean price of all of these types of sleeping bags. Then write a sentence or two to explain what your confidence interval means.
to build a 95% confidence interval for the population mean price of all of these types of sleeping bags. Then write a sentence or two to explain what your confidence interval means.
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:**Question 1a: Sleeping Bag Costs**
How much does a sleeping bag cost? *Backpacker Magazine* took a random sample of the cost of 31 sleeping bags that should keep you warm above 20°F and found that the mean cost was $119.75 with a standard deviation of $17.20. Use a calculator to build a 95% confidence interval for the population mean price of all of these types of sleeping bags. Then write a sentence or two to explain what your confidence interval means.
---
**Question 1b: Number of Chocolate Chips in Cookies**
A sample of 26 Chips Ahoy regular cookies is taken by a Nabisco quality control manager, and it is found that the mean number of chocolate chips per cookie is 20.39. Nabisco knows that the standard deviation, σ, is 2.55 for these cookies.
Use your calculator to build a 98% confidence interval for the real mean number of chocolate chips per cookie. Then write a sentence or two that interprets your confidence interval.
Expert Solution
Step 1
HERE AS PER GUIDELINES I HAVE CALCULATED FIRST MAIN QUESTION AS YOU HAVE POSTED TOTALLY DIFFERENT TWO QUESTIONS.
Backpacker Magazine took a random sample of the cost of 31 sleeping bags that should keep you warm above 20°F and found that the mean cost was $ 119.75 with a standard deviation of $17.20.
sample mean = 119.75$
sample standard deviation = 17.20$
confidence level = 95%
Here population standard deviation unknown ,so use t-critical for confidence interval
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