Data Mining and Modelling Questions with Correct Answers

Data Visualization CORRECT ANSWER The use of visual representations to explore, make sense of, and communicate data (Few, 2007). Why Data Visualization? CORRECT ANSWER 1. Use to clearly communicate information effectively through graphical means such as trends, charts and graphs. 2.Makes data easy to understand and manipulate. 3.Identify trends and outliers very effectively. 4.Speed up decision making within an organization. 5.Share of information across various department. 6.Process and gain insight into large amount of dataset Basic Criteria of Data Visualization CORRECT ANSWER Informative: Data visualization should convey the desired information from the data to the reader. Efficient: Data visualization should be free from ambiguity. Appealing: Data visualization should be captivating and visually pleasing (Consider font size, color, text style etc.) Interactive and Predictive (Optional): When using live dashboards data visualizations should contain variables and filters for users to interact and predict the results of different scenarios. Before Data Visualization CORRECT ANSWER Gather the data to be analyzed and get a clear understanding of the data. Understand the metrics to use and the datatypes available Perform data cleaning (Missing values, outliers etc.,) Select your data visualization tool (Power BI, Tableau, Excel, SPSS etc.,) Develop your data glossary