Preservative Leather Furniture Used in Public Places Can Fade, Crack

question 193

Essay

Preservative Leather furniture used in public places can fade, crack, and deteriorate
rapidly. An airport manager wants to see if a leather preservative spray can make the
furniture look good longer. He buys eight new leather chairs and places them in the
waiting area, four near the south-facing windows and the other four set back from the
windows as shown. He assigned the chairs randomly to these spots.
a. Use the random numbers given to decide which chairs to spray. Explain your method
clearly.
b. Briefly explain why your assignment strategy is important in helping the manager assess
the effectiveness of the leather preservative.

---

Definitions:

Tunica Interna

Also known as the intima, it is the innermost layer of a blood vessel, lining the lumen.

Tunica Intima

The innermost layer of a blood vessel, consisting of a thin layer of endothelial cells that line the lumen.

Tunica Externa

The outermost layer of a blood vessel, composed largely of connective tissues, which provides support and protection.

Tunica Media

The middle layer of the wall of a blood vessel or lymph vessel which is made up of smooth muscle cells and elastic tissue.