InterviewSkill
Chart selection, dashboards, visual encoding, and storytelling for data interviews.
Match the chart to the comparison or relationship you need to show.
Use bars for category comparison, lines for time trends, scatter plots for relationships, and histograms for distributions.
It answers important questions quickly and clearly.
Good dashboards prioritize key metrics, use consistent formatting, provide context, and avoid unnecessary visual clutter.
It maps data values to visual properties like position, length, color, or size.
Position and length are usually easier to compare than area or color intensity, so encoding choice affects accuracy.
They can distort data through bad scales, cherry-picked ranges, or confusing encodings.
Truncated axes, dual axes, missing baselines, and poor aggregation can lead viewers to incorrect conclusions.
Use confidence intervals, error bars, bands, or distribution plots.
Showing uncertainty prevents overconfidence and helps stakeholders understand variability, sample size, and risk.