A Buyer for a Manufacturing Plant Suspects That His Primary

question 108

Multiple Choice

A buyer for a manufacturing plant suspects that his primary supplier of raw materials is overcharging. In order to determine if his suspicion is correct, he contacts a second supplier and asks for the prices on various identical materials. He wants to compare these prices with those of his primary supplier. He collected data on 6 different materials from both suppliers. He suspects that the differences are not normally distributed. Which of the following tests will be the most appropriate?

• A) Pooled-variance t test
• B) Paired t test
• C) Wilcoxon rank sum test
• D) Wilcoxon signed rank test

---

Definitions:

Freons

A trademarked name for a group of chlorofluorocarbon (CFC) and hydrochlorofluorocarbon (HCFC) gases used primarily as refrigerants and aerosol propellants, now commonly linked to ozone depletion.

Propellants

Chemicals that are used to propel an object by generating gas under pressure; common in rockets and aerosol cans.

Aerosol Cans

Containers that use pressurized gas to dispense substances in a fine spray.

N-hexane

A straight-chain alkane with the formula C6H14, used as a non-polar solvent in the extraction of edible oils from seeds and vegetables.