Visualization of Multivariate Data DATA-SCIENCE-OPTIMIZE Practice Questions (Page 1)

Questions 1–5

1. 1expert · hard

   A data analyst is exploring a dataset with 10 numeric variables. The analyst has a scatterplot matrix and a parallel coordinates plot linked together. The analyst brushes a set of points in the scatterplot matrix and notices that the corresponding lines in the parallel coordinates plot all have a similar shape. What does this indicate?

   • AThe brushed observations have the same value for every variable.
   • BThe brushed observations are not related to the parallel coordinates plot.
   • CThe brushed observations share a similar profile across all 10 variables.
   • DThe brushed observations are outliers.
   Reveal Solution Discussion Select an answer first
2. 2application · medium

   A financial analyst is studying 15 market indicators to understand which ones move together. The analyst has already computed the correlation matrix and now wants a single static visual that a non-technical executive can quickly interpret to see the strength and direction of relationships between every pair of indicators. Which visualization is most appropriate?

   • AA heatmap of the correlation matrix with a diverging color scale.
   • BA bar chart of the average correlation of each indicator.
   • CA scatterplot matrix of all 15 indicators.
   • DA parallel coordinates plot of all 15 indicators.
   Reveal Solution Discussion Select an answer first
4. 3application · medium

   A data scientist is exploring a dataset with 20 numeric variables and wants to understand how a subset of observations that forms a cluster in one view behaves across other variables. The scientist needs to select points in a scatterplot and see the corresponding observations highlighted in a parallel coordinates plot. Which interactive feature enables this?

   • AAxis reordering.
   • BBrushing and linking.
   • CZooming and panning.
   • DTooltips on hover.
   Reveal Solution Discussion Select an answer first
5. 4foundation · easy

   In a scatterplot matrix, what does each cell in the grid represent?

   • AA boxplot of two variables side by side.
   • BThe distribution of a single variable.
   • CThe correlation coefficient between two variables.
   • DA scatterplot of two variables, with one variable on the x-axis and the other on the y-axis.
   Reveal Solution Discussion Select an answer first
6. 5foundation · easy

   What is a scatterplot matrix?

   • AA single scatterplot that uses color and size to encode three additional variables.
   • BA grid of scatterplots showing every pairwise combination of variables in a dataset.
   • CA table of correlation coefficients for all pairs of variables.
   • DA three-dimensional plot that shows three variables at once.
   Reveal Solution Discussion Select an answer first