Durable press” cotton fabrics are treated to improve their recovery 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 a random sample of fabric specimens. Assume the populations are approximately normally distributed with unequal variances. A manufacturer believes that the mean wrinkle recovery angle for Hylite is better. A random sample of 25 Hylite (group 1) and 20 Permafresh (group 2) were measured. Test the claim using a 10% level of significance.
Hylite
Permafresh
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The Hypotheses for this problem are:
H0: μ1 = μ2
H1: μ1 > μ2
Find the p-value. Round answer to 4 decimal places. Make sure you put the 0 in front of the decimal.
p-value =
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