Quiz-1 (G2)

Which of the following challenges arise when integrating heterogeneous data sources into a data warehouse?

• Schema integration

• Handling missing values

• Faster query processing

• Data format inconsistencies

The process of selecting the most relevant features in a large dataset is called ___________.

In OLAP, the operation that aggregates data from a lower level to a higher level (e.g., from daily to monthly) is called ___________.

The process of reducing the number of dimensions in a dataset while retaining key information is called ___________.

Which of the following operations in OLAP allow better multi-dimensional analysis?

• Drill-down

• Roll-up

• Histogram equalization

• Slice and Dice

In ETL (Extract, Transform, Load), the step where raw data is cleaned and formatted before being loaded into a warehouse is called ___________.

Principal Component Analysis (PCA) reduces dimensionality by transforming correlated features into a set of ___________ variables.

State Apriori Principle

association rule mining can be viewed as a _________ process. Those are _________________

Frequent Itemset Generation Strategies are ___________