A data analyst has a bar chart showing sales per region. To show the average sales across all regions with a single, straight line on the view, which scope option should be selected when adding the reference line?
Per Cell
Per Pane
Per Axis
Entire Table
The correct answer is "Entire Table". When adding a reference line in Tableau, the scope determines the level at which the reference value is calculated. "Entire Table" calculates the value using all the data in the view and displays one line across the whole table. "Per Pane" would calculate and display a separate line for each pane in the visualization. "Per Cell" would compute the value for each individual cell, which is the most granular level. "Per Axis" is not a valid scope option in the reference line settings.
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