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 two types of treated fabrics: Permafresh Hylite 11 15 16 14 14 20 13 19 10 16 15 12 A manufacturer wants to know how large is the difference in mean wrinkle recovery angle. Give a 99% confidence interval for the difference in mean wrinkle recovery angle: [three decimal accuracy] [three decimal accuracy]

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