The Sample Size Needed to Estimate a Population Mean to Within

question 31

Multiple Choice

The sample size needed to estimate a population mean to within 10 units was found to be 68.If the population standard deviation was 50,then the confidence level used was:

• A)99%
• B)95%
• C)90%
• D)None of these choices.

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Definitions:

Imports

Items or services acquired from overseas to be sold within a country.

Balanced Trade

A situation in which the value of a country's exports equals the value of its imports over a certain period.

Net Exports

The value of a country's exports minus its imports; a positive number indicates a trade surplus, while a negative one indicates a trade deficit.

Trade Surplus

A situation in which a country's exports exceed its imports.