A Quality Control Engineer Is in Charge of the Manufacture

question 286

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)χ² test for difference in proportions
• D)McNemar test

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Definitions:

Ex Situ Conservation

The conservation of genetic resources outside their natural habitats, such as in zoos, botanic gardens, or seed banks.

Biodiversity Hotspot

A biodiversity hotspot is a biogeographic region that is both a significant reservoir of biodiversity and is threatened with destruction.

Habitat Corridors

Strips of natural habitat that connect separated populations, allowing animals and plants to move between areas for feeding, mating, and dispersal.

In Situ Conservation

The practice of conserving biological diversity in the natural habitats where species naturally occur.