WorksheetsData Visualization CT-4
Total questions: 20
Worksheet time: 40mins
Sentiment Analysis is an example of:
Regression
Classification
Clustering
Reinforcement
Learning
1 only
1 and 2
1 and 3
1,2 and 4
Can decision trees be used for performing clustering?
True
False
Which of the following is the most appropriate strategy for data cleaning before performing clustering analysis, given less than the desirable number of data points?
Capping and flouring of variables
Removal of outliers
1 only
2 only
1 and 2
None of the above
After performing K-Means Clustering analysis on a dataset, you observed the following dendrogram. Which of the following conclusion can be drawn from the dendrogram?
There were 28 data points in the clustering analysis
The best no. of clusters for the analyzed data points is 4
The above dendrogram interpretation is not possible for K-Means clustering
The proximity function used is Average-link clustering
How can Clustering (Unsupervised Learning) be used to improve the accuracy of the Linear Regression model (Supervised Learning)?
Creating different models for different cluster groups.
Creating an input feature for cluster ids as an ordinal variable.
Creating an input feature for cluster centroids as a continuous variable.
Creating an input feature for cluster size as a continuous variable.
1 only
1 , 2 and 3
1,2 and 4
All of the above
Which type of data visualization is used to display the relationship between three variables in a 3D space?
Scatter plot matrix
Treemap
Bubble chart
Heatmap
Which type of chart is commonly used to represent hierarchical data with rectangular blocks?
Scatter plot matrix
Treemap
Bubble chart
Heatmap
What does the term "data-driven storytelling" mean in the context of data visualization and reporting?
Using data to enhance the narrative
Telling stories without data
Adding chartjunk
Ignoring data visualization
What is the primary purpose of a "tooltip" in an interactive data visualization?
Adds decorative elements
Provides additional information
Represents the main data
Explains the legend
What is the primary benefit of using "dashboards" in data reporting?
Consolidating multiple visuals
Adding decorative elements
Making charts more complex
Slowing down data analysis
Which data visualization type is often used to display hierarchical data as a radial diagram with concentric circles?
Scatter plot
Sunburst chart
Line chart
Bubble chart
In a data visualization, what does "color saturation" refer to?
The intensity or vividness of color
The use of color in charts
The title of a chart
The number of data points
What is the primary benefit of using "interactive tooltips" in data visualizations?
Add decorative elements
Provide additional information
Represent the main data
Explain the legend
What is the primary purpose of data visualization in data science?
Which color scheme is often used for sequential data in data visualizations to represent a progression from low to high values?
What is the primary advantage of using interactive data visualizations?
Reduces data complexity
Increases data accuracy
Slows down data analysis
Enhances engagement
What does "external representation" mean in the context of data visualization?
The process of converting raw data into visual forms.
The act of displaying data only on external monitors or projectors.
The use of graphical elements to present data outside the human mind.
The method of sharing data with external stakeholders.C
