Data Mining

Correct Answer: K-means clustering is an unsupervised machine learning algorithm that partitions a dataset into K clusters, such that the sum of squared distances between points and the centroid of their respective clusters is minimized.

K-means clustering is an unsupervised machine learning algorithm that partitions a dataset into K clusters, such that the sum of squared distances between points and the centroid of their respective clusters is minimized. K-means clustering is commonly used for clustering tasks, such as customer segmentation or document clustering. The K in K-means refers to the number of clusters that the algorithm should partition the dataset into, which is typically chosen based on prior knowledge or using an elbow criterion.

Correct Answer: Data cleaning is the process of identifying and correcting errors, inconsistencies, and inaccuracies in a data set.

Data cleaning is the process of identifying and correcting errors, inconsistencies, and inaccuracies in a data set. This is a crucial step in data mining, as the quality of the analysis is highly dependent on the quality of the data. Common tasks in data cleaning include removing duplicates, correcting misspellings and typos, handling missing values, and resolving inconsistencies.

Correct Answer: Supervised learning involves training a model on labeled data, while unsupervised learning involves training a model on unlabeled data

The main difference between supervised and unsupervised learning is that in supervised learning, the training data has labels or target values, while in unsupervised learning, the training data does not have labels or target values. In other words, in supervised learning, the model learns to predict the target variable from the input features, while in unsupervised learning, the model learns to find interesting patterns or relationships in the data without any prior knowledge of what the output should be.