NPTEL Data Science For Engineers Week 8 Assignment Solutions
NPTEL Data Science For Engineers Week 8 Assignment Answers 2023
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):-
8.316061 11.952463 16.212213 19.922437
7.453059 12.158682 13.212213 21.158766
8.316061 13.952463 15.212213 19.922437
None of the above
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2. According to the built model, the size of each cluster is _ (the order of values in each option could be different):-
- 13 13 7 14
- 11 18 25 24
- 8 13 16 13
- None of the above
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3. The Between Cluster Sum-of-Squares (BCSS) value of the built K-means model is ______ (Choose the appropriate range)
- 100 – 200
- 200 – 300
- 300 ā 350
- None of the above
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4. The Total Sum-of-Squares value of the built k-means model is _ (Choose the appropriate range)
- 100 – 200
- 200 – 300
- 300 ā 350
- None of the above
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5. Which of the statement is INCORRECT about KNN algorithm?
- KNN works ONLY for binary classification problems
- If k=1, then the algorithm is simply called the nearest neighbour algorithm
- Number of neighbours (K) will influence classification output
- None of the above
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6. K means clustering algorithm clusters the data points based on:-
- Dependent and independent variables
- The eigen values
- Distance between the points and a cluster centre
- None of the above
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7. The method / metric which is NOT useful to determine the optimal number of clusters in unsupervised clustering algorithms is
- Scatter plot
- Elbow method
- Dendrogram
- None of the above
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8. The unsupervised learning algorithm which aims to partition n observations into k clusters in which each observation belongs to the cluster with the nearest centroid is
- Hierarchical clustering
- K-means clustering
- KNN
- None of the above
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