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.
"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 25 Hylite (group 1) and 20 Permafresh (group 2) were measured. Test the claim using a 10% level of significance.
Hylite
Permafresh
141
124
140
145
138
136
138
117
138
133
141
139
141
105
132
127
141
137
135
139
146
165
142
131
139
137
131
147
133
148
146
142
139
116
146
148
137
133
142
136
137
134
137
138
143
The Hypotheses for this problem are:
H0: 1= 2
H1: 1> 2
Find the p-value. Round answer to 4 decimal places. Make sure you put the 0 in front of the decimal.
p-value=___
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Income Tax Fundamentals 2013
Authors: Gerald E. Whittenburg, Martha Altus Buller, Steven L Gill
31st Edition
1111972516, 978-1285586618, 1285586611, 978-1285613109, 978-1111972516
