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(See Steps) Durable press cotton fabrics are treated to improve their recovery from wrinkles after washing. Unfortunately, the treatment also reduces the

Question: 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 untreated fabric with that of fabrics treated by three commercial durable press processes. Five specimens of the same fabric were assigned at random to each group. Here are the data in pounds:

Untreated Permafresh 55 Permafresh 48 Hylite LF
60.1 29.9 24.8 28.8
56.7 30.7 24.6 23.9
61.5 30 27.3 27
55.1 29.5 28.1 22.1
59.4 27.6 30.3 24.2

We want to know if there is a significant difference in breaking strength among the given treatments. Use alpha = 0.05.

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