Report design best practices in Power BI - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Choosing the right chart type for data

You have sales data by region and product category. Which chart type best helps compare sales across categories within each region?

A A stacked bar chart showing sales by category stacked for each region

B A line chart showing sales trends over time for each category

C A pie chart showing total sales by region only

D A scatter plot showing sales versus profit for each product

💡 Hint

Think about comparing parts within groups clearly.

A stacked bar chart allows easy comparison of sales by category within each region, showing both total and part contributions.

❓ visualization

intermediate

Improving dashboard readability

You have a dashboard with many charts and tables crowded together. What is the best practice to improve readability?

A Use very small fonts to fit more data on screen

B Add as many colors as possible to attract attention

C Increase white space and group related visuals logically

D Place all charts in one single page without scrolling

💡 Hint

Think about how your eyes move and focus on information.

Increasing white space and grouping related visuals helps users scan and understand the dashboard easily without feeling overwhelmed.

❓ dax_lod_result

advanced

Calculating sales per customer segment

Given a sales table with CustomerSegment and SalesAmount columns, which DAX measure correctly calculates total sales for the 'Corporate' segment only?

Power BI

Measure options:

A Total Corporate Sales = CALCULATE(SUM(Sales[SalesAmount]), Sales[CustomerSegment] = "Corporate")

B Total Corporate Sales = SUMX(FILTER(Sales, Sales[CustomerSegment] = "Corporate"), Sales[SalesAmount])

C Total Corporate Sales = SUM(Sales[SalesAmount]) WHERE Sales[CustomerSegment] = "Corporate"

D Total Corporate Sales = CALCULATE(SUM(Sales[SalesAmount]), FILTER(Sales, Sales[CustomerSegment] = "Corporate"))

💡 Hint

CALCULATE with FILTER is the correct syntax for conditional aggregation.

Option D uses CALCULATE with FILTER correctly to sum sales only for 'Corporate' segment. Option A is also valid using a shorthand boolean filter argument. Option B works but is less efficient. Option C is invalid syntax.

❓ data_modeling

advanced

Optimizing data model relationships

You have two tables: Customers and Orders. Customers has CustomerID as unique key. Orders has CustomerID as foreign key. What is the best relationship type to model this in Power BI?

A Many-to-one relationship from Orders to Customers with bidirectional filter

B Many-to-many relationship between Customers and Orders with bidirectional filter

C One-to-one relationship between Customers and Orders with single direction filter

D One-to-many relationship from Customers to Orders with single direction filter

💡 Hint

Think about uniqueness and filter direction for lookup tables.

Customers is lookup table with unique CustomerID, Orders is fact table with many orders per customer. One-to-many from Customers to Orders with single direction filter is best practice for performance and clarity.

🎯 Scenario

expert

Designing an accessible report for colorblind users

You are designing a sales report dashboard. How do you ensure it is accessible for users with color vision deficiency?

A Use color palettes with high contrast and add patterns or labels to charts

B Use only red and green colors to highlight increases and decreases

C Avoid using any colors and rely only on text data

D Use pastel colors with low contrast for a soft look

💡 Hint

Consider how colorblind users perceive colors and how to convey information clearly.

High contrast colors combined with patterns or direct labels help colorblind users distinguish data easily. Avoid red-green combinations alone. Text alone reduces visual appeal and pastel colors may lack contrast.

Practice

1. Which of the following is a key principle of good report design in Power BI?

easy

A. Organize visuals logically and use consistent styles

B. Use as many colors as possible to make it vibrant

C. Place all visuals randomly to fill space

D. Avoid labels to keep the report clean

Solution

1. Step 1: Understand report organization

   Good report design means arranging visuals in a logical order so users can follow the story easily.

2. Step 2: Recognize style consistency importance

   Using consistent colors, fonts, and styles helps users focus and not get confused.

3. Final Answer:

   Organize visuals logically and use consistent styles -> Option A

4. Quick Check:

   Logical layout + consistent style [OK]

Hint: Think about what helps users understand data easily [OK]

Common Mistakes:

• Using too many colors that distract
• Randomly placing visuals without order
• Removing labels that explain data

2. Which of these is the correct way to add a title to a visual in Power BI?

easy

A. Use the visual's Format pane and enable the Title option

B. Rename the dataset to the visual's title

C. Add a text box and place it near the visual

D. Add a slicer with the title text

Solution

1. Step 1: Locate the Format pane for the visual

   In Power BI, each visual has a Format pane where you can customize appearance.

2. Step 2: Enable and edit the Title option

   Turning on the Title toggle and typing the desired text adds a proper title directly linked to the visual.

3. Final Answer:

   Use the visual's Format pane and enable the Title option -> Option A

4. Quick Check:

   Format pane Title toggle [OK]

Hint: Titles belong in the visual's Format settings, not separate objects [OK]

Common Mistakes:

• Using text boxes that are not linked to visuals
• Renaming datasets instead of visuals
• Using slicers for titles

3. You have a report page with 4 visuals arranged in a grid. Which layout best follows report design best practices?

medium

A. Use bright contrasting colors for each visual to stand out

B. Place visuals randomly with different sizes and colors

C. Stack all visuals vertically with no spacing

D. Align visuals evenly with consistent sizes and use a limited color palette

Solution

1. Step 1: Evaluate visual arrangement

   Best practice is to align visuals evenly so the report looks clean and organized.

2. Step 2: Assess color and size consistency

   Using consistent sizes and a limited color palette helps users focus on data, not distractions.

3. Final Answer:

   Align visuals evenly with consistent sizes and use a limited color palette -> Option D

4. Quick Check:

   Even alignment + consistent style [OK]

Hint: Think clean grid and consistent colors for easy reading [OK]

Common Mistakes:

• Random placement causing confusion
• Overusing bright colors that distract
• No spacing making visuals cluttered

4. A report has overlapping visuals and inconsistent font sizes. What is the best way to fix these issues?

medium

A. Delete all visuals and start a new report

B. Resize and align visuals properly; use consistent font sizes in Format pane

C. Add more colors to distract from layout issues

D. Ignore issues if data is correct

Solution

1. Step 1: Fix visual overlap by resizing and aligning

   Properly resizing and aligning visuals prevents overlap and improves readability.

2. Step 2: Standardize font sizes using the Format pane

   Consistent font sizes make the report look professional and easier to read.

3. Final Answer:

   Resize and align visuals properly; use consistent font sizes in Format pane -> Option B

4. Quick Check:

   Fix layout + consistent fonts [OK]

Hint: Fix layout and fonts in Format pane, don't ignore problems [OK]

Common Mistakes:

• Ignoring layout issues
• Adding distracting colors instead of fixing layout
• Deleting report unnecessarily

5. You want to create a sales report that guides users to key insights. Which combination of design choices best achieves this?

hard

A. Use only tables with no charts or colors

B. Use many bright colors, place visuals randomly, and avoid labels to keep it simple

C. Use a clear title, highlight important data with color, and arrange visuals in a logical flow

D. Add all possible visuals on one page without grouping or titles

Solution

1. Step 1: Add clear titles to guide users

   Titles help users understand what each visual shows and what to focus on.

2. Step 2: Use color to highlight key data points

   Thoughtful color use draws attention to important insights without overwhelming.

3. Step 3: Arrange visuals logically to tell a story

   A logical flow helps users follow the data story step-by-step.

4. Final Answer:

   Use a clear title, highlight important data with color, and arrange visuals in a logical flow -> Option C

5. Quick Check:

   Title + color highlight + logical flow [OK]

Hint: Guide users with titles, colors, and logical layout [OK]

Common Mistakes:

• Using too many colors that confuse
• Random visual placement
• No titles or labels to explain data