If the Standard Deviation of the Lifetime of a Vacuum

question 119

Short Answer

If the standard deviation of the lifetime of a vacuum cleaner is estimated to be 300 hours, how large of a sample must be taken in order to be 97% confident that the margin of error will not exceed 40 hours?

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Definitions:

Welfare State

The collection of government programs designed to alleviate economic hardship.

Government Spending

The total expenses incurred by a government on goods, services, and public projects.

Wealthy Countries

Nations characterized by a high level of income per capita, advanced infrastructure, and a strong economy.

Social Insurance Program

A government program designed to provide protection against unpredictable financial distress.