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

A histogram bins continuous values into intervals and displays their frequency, making it ideal for showing distributions.

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

Coined by Edward Tufte, the data-ink ratio measures how much of a graphic's ink is devoted to presenting data rather than decoration.

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

Non-technical stakeholders understand business outcomes better than statistical metrics, so framing results in terms of impact is most effective.

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

A negative correlation means as one variable increases the other decreases, producing a downward-sloping pattern of points.

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

A logarithmic scale compresses large ranges so that data spanning multiple orders of magnitude can be visualized without losing detail in smaller values.

Data Science Practice Test

Data Science Practice Test

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