Instruction 7.3 The Lifetimes of a Certain Brand of Light Bulbs Are

question 78

Essay

Instruction 7.3
The lifetimes of a certain brand of light bulbs are known to be normally distributed with a mean of 1,600 hours and a standard deviation of 400 hours. A random sample of 64 of these light bulbs is taken.
-Referring to Instruction 7.3,the probability is 0.20 that the sample mean lifetime differs from the population mean lifetime by at least how many hours?

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Definitions:

Group Conformity

The phenomenon where individuals in a group tend to match their beliefs, attitudes, and behaviors to those of the group.

Cialdini

Refers to Robert Cialdini, renowned for his research in the psychology of persuasion and how it is applied in marketing and influence strategies.

Spiral of Silence Theory

Explains that ideas and opinions expressed in mass media can discourage expressions by people who hold dissenting opinions due to a sensitivity of feeling isolated or rejected.

Sequential Process

A series of steps or stages that are carried out in a specific order to achieve a particular goal or result.