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How have U.S.imports and exports,as a fraction of GDP,changed from 1950 to the present?
Confidence Interval
A range of values, derived from sample statistics, that is believed to contain the true value of an unknown population parameter with a specified level of confidence.
Margin Of Error
A statistic expressing the amount of random sampling error in a survey's results, indicating the expected range in which the true value lies.
Sample Size
The number of observations or individuals in a subset of a population selected for analysis or experimentation.
Hypothesis Test
A statistical method used to determine whether there is enough evidence in a sample of data to infer that a certain condition holds for the entire population.
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