Week 8 Answers
1) According to the built model, the within-cluster sum of squares for each cluster is __________ (the order of values in each option could be different):-
a) 8.316061 11.952463 16.212213 19.922437
b) 7.453059 12.158682 13.212213 21.158766
c) 8.316061 13.952463 15.212213 19.922437
d) None of the above
Answer: A
2) According to the built model, the size of each cluster is _______ (the order of values in each option could be different):-
a) 13 13 7 14
b) 11 18 25 24
c) 8 13 16 13
d) None of the above
Answer: C
3) The Between Cluster Sum-of-Squares (BCSS) value of the built K-means model is _______ (Choose the appropriate range)
a) 100 – 200
b) 200 – 300
c) 300 – 350
d) None of the above
Answer: A
4) The Total Sum-of-Squares value of the built k-means model is ______ (Choose the appropriate range)
a) 100 – 200
b) 200 – 300
c) 300 – 350
d) None of the above
Answer: A
5) Which of the statements is INCORRECT about the KNN algorithm?
a) KNN works ONLY for binary classification problems
b) If k=1, then the algorithm is simply called the nearest neighbour algorithm
c) The number of neighbours (K) will influence classification output
d) None of the above
Answer: A
6) K-means clustering algorithm clusters the data points based on:-
a) Dependent and independent variables
b) The eigenvalues
c) Distance between the points and a cluster centre
d) None of the above
Answer: C
7) The method/metric which is NOT useful to determine the optimal number of clusters in unsupervised clustering algorithms is:
a) Scatter plot
b) Elbow method
c) Dendrogram
d) None of the above
Answer: A
8) The unsupervised learning algorithm that aims to partition n observations into k clusters, where each observation belongs to the cluster with the nearest centroid, is:
a) Hierarchical clustering
b) K-means clustering
c) KNN
d) None of the above
Answer: B
