A Quality Control Engineer Is in Charge of the Manufacture

question 30

Multiple Choice

A quality control engineer is in charge of the manufacture of computer disks. Two different processes can be used to manufacture the disks. He suspects that the Kohler method produces a greater proportion of defects than the Russell method. He samples 150 of the Kohler and 200 of the Russell disks and finds that 27 and 18 of them, respectively, are defective. If Kohler is designated as "Group 1" and Russell is designated as "Group 2," which of the following tests will you use to find out if the Kohler method is worse than the Russell method?

• A) Paired t test
• B) Z test for difference in proportions
• C) X² test for difference in proportions
• D) McNemar test

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Definitions:

Trucks

Heavy vehicles designed for transporting goods, often playing a critical role in logistics and supply chains.

Cars

Wheeled motor vehicles used primarily for transportation of people.

Comparative Advantage

The ability of an individual, company, or country to produce a particular good or service at a lower opportunity cost than its competitors.

Import

The act of bringing goods or services into a country from abroad for the purpose of trade.