Find the hypothesis for the problem
Cheruiyot
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"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 |
|
Find the p-value. Round answer to 4 decimal places. Make sure you put the 0 in front of the decimal.
p-value