You are a data analyst for a retail company. A sales manager has a Power BI report containing a line chart that displays total sales by month over the past three years. The manager wants to project sales for the next six months to aid in inventory planning. Crucially, they also need to visualize the potential best-case and worst-case scenarios for this projection. Which feature from the Analytics pane should you use to fulfill this specific request?
Enable Error bars and configure the upper and lower bounds based on a fixed percentage of sales.
Add a Trend line and set its style to dashed to show the likely direction of sales.
Add separate Min and Max lines to show the historical minimum and maximum sales on the chart.
Use the Forecast feature and adjust the Confidence interval to display the upper and lower bounds.
The correct approach is to use the Forecast feature. The Forecast feature, available for line charts in the Analytics pane, is specifically designed for time-series forecasting. By setting the 'Forecast length' to six months and adjusting the 'Confidence interval' (e.g., to 95%), Power BI will project future sales and display a shaded area or lines representing the upper and lower bounds of the prediction, which corresponds to the 'best-case' and 'worst-case' scenarios requested by the manager.
A Trend line shows the general direction of historical data but does not project future values or provide confidence bands for a forecast. Error bars are used to show the variability or uncertainty for existing data points, not to predict future ones. Min and Max lines are reference lines that mark the lowest and highest historical values in the dataset; they do not perform a forward-looking projection.
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