"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 146 Hylite 172 127 141 156 151 136 132 192 A manufacturer wants to know how large is the difference (Permafresh - Hylite) in mean wrinkle recovery angle. a. The mean and the standard deviation for the Permafresh are: Permafresh 139.4 Round to 3 decimal places. SPermafresh 155.327 Round to 3 decimal places. b. The mean and the standard deviation for the Hylite are: Hylite Round to 3 decimal places. Round to 3 decimal places. SHylite c. Can we assume equal variances or not? No, we cannot assume equal variances. Yes, we can assume equal variances. d. The standard error is: SE = Round to 3 decimal places. e. What is the degrees of freedom associated with this problem? (Round down to the nearest whole number.) The critical value from the distribution for a confidence interval of 92% is: t*= Use Technology Round to 3 decimal places. f. Using the the answer from above (all rounded to 3 decimal places), calculate by hand a 92% confidence interval for the difference (Permafresh - Hylite) in mean wrinkle recovery angle: