Question 3: Hierarchical methods
			(a)  What do the single link and complete link methods have in common? (b)  Explain the concept of intercluster similarity. (c)  Explain the concept behind the single link method of cluster analysis.  What are its advantages?  What are its disadvantages? (d)  Explain the concept behind the complete link method of cluster analysis.  What are its advantages?  What are its disadvantages?
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