PL-300 Visualize and analyze the data Practice Question
You have a report with a line chart showing monthly sales. Users need to see the exact sales value when they hover over a data point. What should you configure?
⚠ Common exam trap
It's easy for candidates to confuse data labels (which show values permanently on the chart) with tooltips (which show values on hover), leading them to select option A instead of understanding that tooltips are the correct interactive mechanism for this requirement.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the visual's tooltip to display the value.
Tooltips in Power BI are designed to show detailed information about a data point when the user hovers over it. By default, the visual's tooltip already includes the value, but if it has been customized or removed, you need to ensure the tooltip is configured to display the sales value. This provides an interactive way to see exact numbers without cluttering the chart with permanent labels.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable data labels on the chart.
Why it's wrong here
Enabling data labels adds permanent numeric annotations directly on the chart line or points, so the sales value would be visible constantly rather than only on hover. This does not satisfy the requirement to see the value in a tooltip, and it clutters the visual, obscuring the trend. The hover-based inspection is handled by the tooltip, not by data labels.
- ✓
Configure the visual's tooltip to display the value.
Why this is correct
To see the monthly sales value on hover, ensure the line chart's tooltip is enabled in the Format pane and that the Sales measure is included in the Tooltip well (it is by default). When configured, hovering a point shows a tooltip displaying the category, series name, and the measure value. If the tooltip is currently not appearing, verify the tooltip toggles are on and no report page tooltip has overridden it.
- ✗
Add a report page tooltip.
Why it's wrong here
A report page tooltip is a custom tooltip page that can display rich, multi-visual content, but it is overkill for simply showing the sales value on hover. Creating one requires a separate page and explicitly assigning it in the visual's Tooltip property, which replaces the default tooltip. For a basic value display, the default tooltip already provides this without extra setup, so adding a report page tooltip is unnecessary and may complicate the report.
- ✗
Set the category label to show the value.
Why it's wrong here
Category labels in a line chart refer to the axis labels (e.g., month names) that identify the categories, and they are static text, not interactive elements that appear on hover. There is no Power BI setting to make a category label display the value in a tooltip; that behavior belongs exclusively to the visual's tooltip. Thus, changing category labels would not produce the desired hover value display and would only alter the text shown on the axis.
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