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    Regression: Data Point Table

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    The data table below tabulates a Pizza Parlor's advertising expenditures and sales for 8 consecutive quarters. The marketing manager wants to know how much of an impact current advertising will have on sales two quarters from now.

    When running a regression with the dependent variable "Sales" and the independent variable "Advertising lagged by two quarters," how many data points can she use, given the available data?

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