Looking at the Record of Concentration in the United States

question 20

Multiple Choice

Looking at the record of concentration in the United States during the last century, one finds concentration has

• A)steadily increased.
• B)risen dramatically in the past 15 years.
• C)changed very little.
• D)fallen steadily except in wartime.

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Definitions:

First-Order Autocorrelation

The correlation of a signal with a delayed version of itself, particularly measuring the correlation between values that are one time period apart.

First-Order Autocorrelation

The correlation between values in a time series and the values immediately preceding them.

Durbin-Watson Statistic

A measure used to detect the presence of autocorrelation in the residuals from a regression analysis.

Hypotheses Testing

A method in statistics that applies data from a subset to assess assumptions about a broader population's characteristic.