7.120 Recovery from wrinkles.
Of course, the reason for durable press treatment is to reduce wrinkling. “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 the same fabric specimens discussed in the previous two exercises:
wrinkle
Permafresh 55 | 136 | 135 | 132 | 137 | 134 |
Hylite LF | 143 | 141 | 146 | 141 | 145 |
Which process has better wrinkle resistance? Is the difference statistically significant?