"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 18 15 13 14 16 19 12 16 11 A manufacturer wants to know how large is the difference in mean wrinkle recovery angle. Give a 98% confidence interval for the difference in mean wrinkle recovery angle:

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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 two types of treated fabrics:
Permafresh
Hylite
15
18
13
14
16
19
12
16
11
A manufacturer wants to know how large is the difference in mean wrinkle recovery angle.
Give a 98% confidence interval for the difference in mean wrinkle recovery angle:
[three decimal accuracy] [three decimal accuracy)
Transcribed Image Text:"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 15 18 13 14 16 19 12 16 11 A manufacturer wants to know how large is the difference in mean wrinkle recovery angle. Give a 98% confidence interval for the difference in mean wrinkle recovery angle: [three decimal accuracy] [three decimal accuracy)
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