Professor Ziegenfuss of the Geology Department Has Ordered a New

question 25

Multiple Choice

Professor Ziegenfuss of the Geology Department has ordered a new instrument that is supposed to measure the iron content of iron ore. After the instrument arrives, he uses it to measure the iron content of five test samples of ore, all of which are known to be exactly 16 percent iron. The numbers given by the machine on these five test samples are 8 percent, 3 percent, 28 percent, 16 percent, and 25 percent. Based on these measurements, one can conclude that the new instrument:

• A) is unbiased.
• B) is not reliable.
• C) suffers from the placebo effect.
• D) is confounded.
• E) Both A and B are correct.

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Definitions:

Comparable

Capable of being likened or shown to be similar in nature or quality.

Illegal

Activities or actions that are forbidden by law or statute, falling outside the boundaries of legal behavior.

Different Wages

The variation in earnings paid to employees for their work, often based on factors like experience, skill, job type, or geographical location.

Human-capital Investment

The process of acquiring and enhancing an individual's skills and knowledge, which increases potential productivity and earnings.