"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 the same fabric specimens discussed in the previous exercise: Permafresh Hylite 106 165 126 171 155 142 153 187 117 A manufacturer wants to know how large is the difference in mean wrinkle recovery angle. The mean and the standard deviation for the Permafresh are: ¯x= s= Round to 3 decimal places. 2. The mean and the standard deviation for the Hylite are: ¯x= s= Round to 3 decimal places. 3.The standard error is: SE = ________ Round to 3 decimal places. The critical value from the distribution for a confidence interval of 98% is: t*= ________Use degrees of freedom of 3. Use Technology Round to 3 decimal places. Using the the answer from above (all rounded to 3 decimal places), calculate by hand a 98% confidence interval for the difference in mean wrinkle recovery angle: ________ to ________Round to 3 decimal places.
"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 the same fabric specimens discussed in the previous exercise: Permafresh Hylite 106 165 126 171 155 142 153 187 117 A manufacturer wants to know how large is the difference in mean wrinkle recovery angle. The mean and the standard deviation for the Permafresh are: ¯x= s= Round to 3 decimal places. 2. The mean and the standard deviation for the Hylite are: ¯x= s= Round to 3 decimal places. 3.The standard error is: SE = ________ Round to 3 decimal places. The critical value from the distribution for a confidence interval of 98% is: t*= ________Use degrees of freedom of 3. Use Technology Round to 3 decimal places. Using the the answer from above (all rounded to 3 decimal places), calculate by hand a 98% confidence interval for the difference in mean wrinkle recovery angle: ________ to ________Round to 3 decimal places.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section: Chapter Questions
Problem 22SGR
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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 the same fabric specimens discussed in the previous exercise:
| Permafresh | Hylite |
|---|---|
| 106 | 165 |
| 126 | 171 |
| 155 | 142 |
| 153 | 187 |
| 117 |
A manufacturer wants to know how large is the difference in mean wrinkle recovery angle.
- The mean and the standard deviation for the Permafresh are:
¯x= s=
- Round to 3 decimal places.
2. The mean and the standard deviation for the Hylite are:
¯x= s= - Round to 3 decimal places.
3.The standard error is:
SE = ________ Round to 3 decimal places.
The critical value from the distribution for a confidence interval of 98% is:
t*= ________Use degrees of freedom of 3. Use Technology Round to 3 decimal places. - Using the the answer from above (all rounded to 3 decimal places), calculate by hand a 98% confidence interval for the difference in mean wrinkle recovery angle:
________ to ________Round to 3 decimal places.
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