The accompanying summary data on compression strength

(lb) for in. boxes appeared in the article

“Compression of Single-Wall Corrugated Shipping Containers Using Fixed and Floating Test Platens” (J. Testing and Evaluation, 1992: 318–320). The authors stated that

“the difference between the compression strength using fixed and floating platen method was found to be small compared to normal variation in compression strength between identical boxes.” Do you agree? Is your analysis predicated on any assumptions?

Sample Sample Sample Method Size Mean SD Fixed 10 807 27 Floating 10 757 41