Chart Selection and Dashboard Design
Visualization questions test choosing charts for comparisons, trends, distributions, composition, relationships, geography, dashboards, filters, and visual hierarchy.
How to study for CompTIA Data+
Treat each Data+ item as an analytics decision: identify the source, quality issue, transformation, statistic, visual, audience, and control.
Core concepts
Concept 1
Chart selection should match the analytical question and data type.
Exam cue: Match chart to trend, comparison, distribution, relationship, or composition.
Concept 2
Dashboards should prioritize decisions, audience, KPIs, filters, context, and scanability.
Exam cue: Design dashboard layout around audience decisions.
Concept 3
Visual encoding choices can clarify or distort patterns.
Exam cue: Avoid misleading scales, clutter, and decorative effects.
Risk pitfalls and guardrails
Using a pie chart for many categories or precise comparisons.
Guardrail: Avoid answers that skip profiling, overclaim causation, hide limitations, choose misleading visuals, or expose sensitive data.
Starting a bar axis away from zero when comparing magnitude.
Guardrail: Avoid answers that skip profiling, overclaim causation, hide limitations, choose misleading visuals, or expose sensitive data.
Putting every metric on a dashboard without prioritization.
Guardrail: Avoid answers that skip profiling, overclaim causation, hide limitations, choose misleading visuals, or expose sensitive data.
Memory anchors
Bar Chart
A bar chart compares quantities across categories clearly.
Line Chart
A line chart shows trends over ordered time or sequence.
Scatter Plot
A scatter plot shows relationships between two numerical variables.
Histogram
A histogram shows distribution of a numerical variable across bins.
Box Plot
A box plot summarizes distribution, spread, median, and potential outliers.
Heat Map
A heat map uses color intensity to show patterns across two dimensions.
Dashboard
A dashboard combines key visuals and indicators for monitoring or decisions.
Filter
A filter lets users focus a view on selected values or periods.
Visual Hierarchy
Visual hierarchy guides attention to the most important information first.
Misleading Scale
A misleading scale distorts interpretation by exaggerating or hiding differences.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
A report compares revenue across eight product categories for one quarter. Which action best addresses the requirement? Use only the facts stated.
A dashboard shows weekly subscriptions over two years. How should the analyst proceed? Use only the facts stated.
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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