"Durable press" cotton fabrics are treated to improve their recovery from wrinkles after washing. "Wrinkle recovery angle" measures how well a fabric recovers from wrinkles. Higher is better. Here are data on the wrinkle recovery angle (in degrees) for a random sample of fabric specimens. Assume the populations are approximately normally distributed with unequal variances. A manufacturer believes that the mean wrinkle recovery angle for Hylite is better. A random sample of 20 Permafresh (group 1) and 25 Hylite (group 2) were measured. Test the claim using a 5% level of significance.

"Durable press" cotton fabrics are treated to improve their recovery from wrinkles after washing. "Wrinkle recovery angle" measures how well a fabric recovers from wrinkles. Higher is better. Here are data on the wrinkle recovery angle (in degrees) for a random sample of fabric specimens. Assume the populations are approximately normally distributed with unequal variances. A manufacturer believes that the mean wrinkle recovery angle for Hylite is better. A random sample of 20 Permafresh (group 1) and 25 Hylite (group 2) were measured. Test the claim using a 5% level of significance.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

"Durable press" cotton fabrics are treated to improve their recovery from wrinkles after washing. "Wrinkle
recovery angle" measures how well a fabric recovers from wrinkles. Higher is better. Here are data on the
wrinkle recovery angle (in degrees) for a random sample of fabric specimens. Assume the populations are
approximately normally distributed with unequal variances. A manufacturer believes that the mean wrinkle
recovery angle for Hylite is better. A random sample of 20 Permafresh (group 1) and 25 Hylite (group 2)
were measured. Test the claim using a 5% level of significance.
Permafresh
Hylite
140
136
108
132
123
146
149
145
121
144
135
135
123
141
129
133
133
139
137
126
140
134
127
138
155
147
142
132
125
134
137
141
124
142
137
137
121
138
134
141
124
143
137
136
140
Họ: Select an answer V
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Select the correct symbols.
Test Statistic=
(Give answer to 4 decimal places)
p-value=
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Based on the above we choose to Select an answer
The correct summary would be: Select an answer
v that the mean wrinkle
recovery angle for Hylite is better.

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