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9. While an analyst considers the time plot of the closing value of the Dow Jones Industrial Average, he notices a trend. This means he

9. While an analyst considers the time plot of the closing value of the Dow Jones Industrial Average, he notices a trend. This means he sees a. a persistent long-term rise or fall. b. changes due to nonresponse. c. changes due to confounding. d. a pattern in a time series that repeats itself at known regular intervals of time. e. the margin of error

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