Durable press cotton fabrics are treated to improve their re

\"Durable press\" cotton fabrics are treated to improve their recovery from wrinkles after washing. Unfortunately, the treatment also reduces the strength of the fabric. A study compared the breaking strength of fabrics treated by two commercial durable press processes. Five specimens of the same fabric were assigned at random to each process. Here are the data, in pounds of pull needed to tear the fabric:

Solution

Answer: C. 1.32 to 7.36

Permafresh	Hylite
29.540	25.200	mean
1.167	2.669	std. dev.
5	5	n