Data Science Data Science Data Visualization and Communication Questions and Answers 2

Question 1

Which type of chart is most appropriate for displaying the distribution of a single continuous variable?

Accepted Answer

Histogram

Answer

Pie chart

Answer

Scatter plot

Answer

Treemap

Question 2

What does the term 'data-ink ratio' refer to in data visualization?

Accepted Answer

The proportion of ink used to display actual data versus non-data elements

Answer

The resolution quality of a printed chart

Answer

The ratio of colored to black-and-white elements

Answer

The number of data points per square inch of a graphic

Question 3

When presenting model performance results to a non-technical business audience, which approach is generally most effective?

Accepted Answer

Translate metrics into business impact such as revenue or cost savings

Answer

Show ROC curves and confusion matrices with detailed annotations

Answer

Present raw accuracy percentages across all model iterations

Answer

Display the full mathematical derivation of the evaluation metric

Question 4

In a scatter plot, what does a strong negative correlation between two variables look like?

Accepted Answer

Points trend downward from left to right

Answer

Points trend upward from left to right

Answer

Points form a horizontal band

Answer

Points cluster in the center of the plot

Question 5

What is the primary purpose of using a logarithmic scale on a chart axis?

Accepted Answer

To display data that spans several orders of magnitude more clearly

Answer

To make all data points equidistant from each other

Answer

To convert categorical data into continuous data

Answer

To increase the number of gridlines on the axis

Question 6

Which visualization technique is best suited for showing how a total value is broken down into parts over time?

Accepted Answer

Stacked area chart

Answer

Box plot

Answer

Scatter matrix

Answer

Violin plot