4 Data Visualization Free Online FlashCards

What should guide a chart choice?

Start with the decision or question the chart should support, then choose a visual form that makes the relevant comparison or pattern clear.

Why should a bar chart usually start at zero?

Use a zero baseline because bar length encodes magnitude; truncating the axis can exaggerate differences.

What should chart labels specify about measurements?

Label units and time periods clearly so readers can distinguish, for example, dollars from thousands of dollars and monthly from annual totals.

What context can change how a result is understood?

Targets, benchmarks, sample sizes, and data limitations can change how results should be interpreted.

What should a concise chart title communicate?

Write a concise title that states the chart’s main finding or comparison.

How can a chart distinguish groups accessibly?

Do not rely on color alone; add labels, patterns, or other cues so groups remain distinguishable for people with color-vision differences and in grayscale.

Which chart compares values across categories?

Use a bar chart to compare values across categories, such as revenue across product groups.

Which chart shows change over time?

Use a line chart to show change over time, such as monthly revenue across several years.

Which charts help examine a distribution?

Use a histogram or box plot to examine how values are distributed, such as order sizes or delivery times.

Which chart explores relationships between two measures?

Use a scatterplot to explore whether two measures move together, such as advertising spend and sales.

When is a stacked bar chart useful?

Use a stacked bar chart to show how a total is divided among a small number of components.

When can a line chart use a nonzero baseline?

A nonzero baseline can help show small changes in a line chart, but label the scale clearly and give enough context to avoid overstating the trend.