FEM 2063 Data Analytics Chapter 8: Clustering Quiz
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Questions and Answers

What is the main goal of clustering?

  • To predict the outcome of a target variable
  • To classify data into predefined categories
  • To find distinct groups in a data set that are similar within each group (correct)
  • To calculate the mean of the dataset

Which type of learning are clustering methods categorized under?

  • Reinforcement learning
  • Supervised learning
  • Semi-supervised learning
  • Unsupervised learning (correct)

How are points within the same cluster expected to be?

  • No similarity required
  • Randomly assigned
  • As similar as possible (correct)
  • As different as possible

What is one common application of clustering in business?

<p>Market Segmentation (B)</p> Signup and view all the answers

Which clustering technique involves finding centroids and updating the cluster assignments iteratively?

<p>K-Means Clustering (A)</p> Signup and view all the answers

In clustering, what does it mean to say points in the same group are 'quite similar'?

<p>Have minimal differences based on a defined similarity measure (D)</p> Signup and view all the answers

What is the key property of the clusters in K-Means Clustering?

<p>The clusters are non-overlapping (B)</p> Signup and view all the answers

What is the objective of K-Means Clustering?

<p>To minimize the within-cluster variation (D)</p> Signup and view all the answers

How is the within-cluster variation W(Ck) defined in K-Means Clustering?

<p>As the sum of squared Euclidean distances between observations in the cluster (B)</p> Signup and view all the answers

What is the optimization problem that defines K-Means Clustering?

<p>Minimize the sum of squared Euclidean distances between observations and their assigned cluster centroids (C)</p> Signup and view all the answers

What is one of the weaknesses of K-Means Clustering mentioned in the text?

<p>It requires the user to specify the number of clusters (K) in advance (A)</p> Signup and view all the answers

What is one of the strengths of K-Means Clustering mentioned in the text?

<p>It is a simple iterative method (D)</p> Signup and view all the answers

What is the main objective of K-means clustering?

<p>Classifying observations based on features (C)</p> Signup and view all the answers

In K-means clustering, what is done at the end of the 1st iteration?

<p>Determining which points belong to which clusters (A)</p> Signup and view all the answers

What criterion is used to determine when to stop the K-means clustering process?

<p>Minimum movement of cluster centers (C)</p> Signup and view all the answers

Which property must sets 𝐶1, ..., 𝐶𝑘 satisfy in K-means clustering?

<p>Disjointness: no observation can belong to multiple clusters (B)</p> Signup and view all the answers

What is the purpose of finding the Euclidean distance between cluster center and each point in K-means clustering?

<p>To update the cluster centers iteratively (D)</p> Signup and view all the answers

Which step in K-means clustering involves recalculating the cluster centers based on the points assigned to each cluster?

<p>Finding the new cluster centers (C)</p> Signup and view all the answers

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