Tableau-Desktop-Found Exploring and Analyzing Data Practice Question
Which mark type is best suited for showing the trend of sales over time?
⚠ Common exam trap
Candidates sometimes select bar charts or scatter plots for time-series analysis, forgetting that line charts are specifically designed to show continuous trends over time.
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
✓
Line chart.
A line mark type is the standard for time-series data because it highlights the continuity and direction of trends. By connecting data points, it allows the human eye to easily follow the path and identify patterns, seasonality, or anomalies. Choosing the correct mark type is fundamental to effective data storytelling and ensures that users can interpret the time-based relationships in the data without ambiguity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Bar chart.
Why it's wrong here
Bar charts are excellent for comparison between categories but are less effective for showing long-term trends. A line chart is superior for emphasizing the progression of data over time, as the line explicitly indicates the path and sequence of events, which is more intuitive for analyzing historical trends and projections.
- ✓
Line chart.
Why this is correct
Line charts are specifically optimized to display trends over continuous time periods. By linking individual data points, they show the direction and magnitude of change effectively. This helps users quickly grasp whether performance is increasing, decreasing, or fluctuating, which is the primary objective when analyzing time-series data in business contexts.
- ✗
Scatter plot.
Why it's wrong here
Scatter plots are designed for finding correlations between two numerical variables. They are not appropriate for time-series trends because they do not suggest a sequential relationship between data points. Using a scatter plot for time data makes it very difficult for the viewer to infer the chronological order of the data.
- ✗
Heat map.
Why it's wrong here
Heat maps are used for density analysis or comparing multiple categories against each other using color intensity. They are not ideal for showing trends over time because they lack the clarity of a continuous line. Users would have to spend too much cognitive effort interpreting the color intensity instead of seeing the trend.
About these practice questions
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Tableau (Salesforce) exam blueprint
This Tableau-Desktop-Found practice question is part of Courseiva's free Tableau (Salesforce) certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the Tableau-Desktop-Found exam.