The void volume within a textile fabric affects comfort, flammability, and insulation properties. Permeability of a fabric refers to the accessibility of void space to the flow of a gas or liquid. We have summary information on air permeability (in cm³/cm2/sec) for two different types of plain weave fabric (see below) Cotton: 51.7,49.5,50.5.47.7.477.50.3.51.5.552.48.5,50.5,49.7.46.2 58.9.55.5.62.1,57.8.60.3,58.6,60.8.58.5,61.2,61.8,64.3,59.5 Acetate: (1) Find a 98% confidence interval for the true difference in mean permeability. #Acetate - Cotton Number Number ) Enter your answers correct to 2 decimal places (2) What assumptions did you make to answer this question? Do they seem reasonable? Tick all that apply The sample mean difference is approximately normal. (Seems reasonable since np(1-p) > 5.) Data are approximately normal. (But data are strongly skewed, from the normal quantile plot, so this is not reasonable.) We have two independent random samples of measurements. (Whether this is satisfies depends on the study design.) Data are approximately normal. (Seems reasonable from the normal quantile plot.) Standard deviations are equal. (Seems reasonable, from the data.)
The void volume within a textile fabric affects comfort, flammability, and insulation properties. Permeability of a fabric refers to the accessibility of void space to the flow of a gas or liquid. We have summary information on air permeability (in cm³/cm2/sec) for two different types of plain weave fabric (see below) Cotton: 51.7,49.5,50.5.47.7.477.50.3.51.5.552.48.5,50.5,49.7.46.2 58.9.55.5.62.1,57.8.60.3,58.6,60.8.58.5,61.2,61.8,64.3,59.5 Acetate: (1) Find a 98% confidence interval for the true difference in mean permeability. #Acetate - Cotton Number Number ) Enter your answers correct to 2 decimal places (2) What assumptions did you make to answer this question? Do they seem reasonable? Tick all that apply The sample mean difference is approximately normal. (Seems reasonable since np(1-p) > 5.) Data are approximately normal. (But data are strongly skewed, from the normal quantile plot, so this is not reasonable.) We have two independent random samples of measurements. (Whether this is satisfies depends on the study design.) Data are approximately normal. (Seems reasonable from the normal quantile plot.) Standard deviations are equal. (Seems reasonable, from the data.)
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
M
Transcribed Image Text:The void volume within a textile fabric affects comfort, flammability, and insulation properties. Permeability of a fabric refers to the accessibility of void space
to the flow of a gas or liquid. We have summary information on air permeability (in cm³/cm2/sec) for two different types of plain weave fabric (see below).
Cotton: 51.7,49.5,50.5.47.7 47.7.50.3,51.5,55 2,48.5,50.5,49.7.46.2
Acetate:
58.9.55.5.62.1,57.8,60.3,58.6.60.8.58.5,61.2.61.8,64.3,59.5
(1) Find a 98% confidence interval for the true difference in mean permeability. /Acetate - #Cotton
(Number
Number
) Enter your answers correct to 2 decimal places.
(2) What assumptions did you make to answer this question? Do they seem reasonable? Tick all that apply
The sample mean difference is approximately normal
(Seems reasonable since np(1-p) > 5.)
Data are approximately normal.
(But data are strongly skewed, from the normal quantile plot, so this is not reasonable.)
We have two independent random samples of measurements.
(Whether this is satisfies depends on the study design.)
Data are approximately normal
(Seems reasonable from the normal quantile plot.)
Standard deviations are equal.
(Seems reasonable, from the data.)
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 3 steps with 2 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