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:

Common-Size Balance Sheet

A balance sheet that displays each line item as a percentage of total assets, facilitating comparison with other companies regardless of size.

Percentage of Net Assets

This refers to a metric that calculates what portion of a company’s total net assets is represented by a particular investment or asset class.

Retained Earnings Account

An equity account that represents the accumulated portion of net income left over after dividends are paid to shareholders.

Cumulative Earnings

The total net income of a company since its inception, minus any dividends paid to shareholders.