MC	The aim of clustering is to come up with clusters such that the...	homogeneity within a cluster is minimized and the heterogeneity between clusters is maximized.	incorrect	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 minimized.	incorrect	homogeneity within a cluster is maximized and the heterogeneity between clusters is maximized.	correct	
MC	What statement about the adjacency matrix representing a social network is not true?	It has the same number of rows and columns. 	incorrect	It is sparse since it contains a lot of non-zero elements.	correct	It can include weights. 	incorrect	It is a symmetric matrix.	incorrect	
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:	Minimal	incorrect	Maximal	correct	
MC	Which statement is CORRECT?	To guarantee maximum independence and organizational impact of analytics, it is important that analytics is supervised only locally in the business units.	incorrect	Missing values and outliers should both always be replaced or removed.	incorrect	The big footprint access to data management and analytics capabilities is a serious drawback of cloud based solutions.	incorrect	Quality of data is key to the success of any analytical exercise since it has a direct and measurable impact on the quality of the analytical model and hence its economic value.	correct	
MC	Which of the following measures cannot be used to make the splitting decision in a regression tree?	Entropy	correct	ANOVA/F-test	incorrect	Mean Squared Error (MSE)	incorrect	
MC	Which of the following costs should be included in a Total Cost of Ownership (TCO) analysis?	Acquisition costs	incorrect	Ownership and operation costs	incorrect	Post ownership costs	incorrect	All of these costs	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:	Minimal	incorrect	Maximal	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	Clustering, association rules and sequence rules are examples of:	Predictive analytics	incorrect	Descriptive analytics	correct	
MC	Which of the following measures cannot be used to make the splitting decision in a regression tree?	Entropy	correct	Mean Squared Error (MSE)	incorrect	ANOVA/F-test	incorrect