The Lifetime (In Hours)of a 60-Watt Light Bulb Is a Random

question 49

Multiple Choice

The lifetime (in hours) of a 60-watt light bulb is a random variable that has a Normal distribution with  = 30 hours.A random sample of 25 bulbs put on test produced a sample mean lifetime of = 1038.If in the study of the lifetime of 60-watt light bulbs it was desired to have a margin of error no larger than 6 hours with 99% confidence,how many randomly selected 60-watt light bulbs should be tested to achieve this result?

• A)13
• B)97
• C)165
• D)42
• E)Not within ± 2 of any of the above

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Definitions:

Behaviorism

Behaviorism is a scientific approach to psychology that focuses on observable behaviors and dismisses mental activities that cannot be directly observed.

John B. Watson

An American psychologist who established the psychological school of behaviorism, emphasizing the study of observable behavior over the study of the mind.

B. F. Skinner

A renowned American psychologist best known for his work in developing the theory of behaviorism and operant conditioning.

The Animal Mind

The study of the mental processes and behaviors of non-human animals.