MC	Which statement is CORRECT?	The geodesic represents the longest path between two nodes.	incorrect	The betweenness counts the number of the times that a node or edge occurs in the geodesics of the network.	correct	The graph theoretic center is the node with the highest minimum distance to all other nodes.	incorrect	The closeness is always higher than the betweenness.	incorrect	
MC	The aim of clustering is to come up with clusters such that the...	homogeneity within a cluster is maximized and the heterogeneity between clusters is maximized.	correct	homogeneity within a cluster is maximized and the heterogeneity between clusters is minimized.	incorrect	homogeneity within a cluster is minimized and the heterogeneity between clusters is maximized.	incorrect	homogeneity within a cluster is minimized and the heterogeneity between clusters is minimized.	incorrect	
MC	Which statement is CORRECT?	When using on premise solutions, maintenance or upgrade projects may even go by unnoticed.	incorrect	On premise solutions catalyze improved collaboration across business departments and geographical locations.	incorrect	The big footprint access to data management and analytics capabilities is a serious drawback of cloud based solutions.	incorrect	An important advantage of cloud based solutions concerns the scalability and economies of scale offered. More capacity (e.g. servers) can be added on the fly whenever needed. 	correct	
MC	Consider a data set with a multiclass target variable as follows: 25% bad payers, 25% poor payers, 25% medium payers and 25% good payers. In this case, the entropy will be:	Maximal	correct	Minimal	incorrect	
MC	Which of the following are interesting data sources to consider to boost the performance of analytical models?	Network data	incorrect	External data	incorrect	Unstructured data such as text data and multimedia data	incorrect	All of the above	correct	
MC	Bootstrapping refers to:	Drawing samples without replacement.	incorrect	Drawing samples with replacement.	correct	
MC	Given the following decision tree:<br><br><img class="img-fluid" src="http://www.pdbmbook.com/static/quiz/fig20_6.png"><br><br>According to the decision tree, an applicant with Income > $50.000 and High Debt=Yes is classified as:	Good Risk	incorrect	Bad Risk	correct	
MC	Which statement is CORRECT?	Data owners are the data quality experts who are in charge of assessing data quality by performing extensive and regular data quality checks. 	incorrect	The graph theoretic center is the node with the highest minimum distance to all other nodes.	incorrect	Outlying observations which represent erroneous data are treated using missing value procedures.	correct	Featurization in the context of neural networks refers to adding more nodes to the network.	incorrect	
MC	Which of the following measures cannot be used to make the splitting decision in a regression tree?	Mean Squared Error (MSE)	incorrect	ANOVA/F-test	incorrect	Entropy	correct	
MC	Which of the following is not an advantage of open source software for analytics?	A world-wide network of developers can work on it.	incorrect	It is available for free.	incorrect	It has been thoroughly engineered and extensively tested, validated and completely documented.	correct	It can be used in combination with commercial software. 	incorrect