Data Science MCQs with answers Page - 28

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Q. What is the primary purpose of a data cube in data modeling?

  • (A) To visualize the data distribution
  • (B) To represent multi-dimensional data
  • (C) To define data attributes and properties
  • (D) To calculate summary statistics

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Q. In data modeling, what is the term for the process of converting categorical data into numerical format for modeling purposes?

  • (A) Data Aggregation
  • (B) Data Cleaning
  • (C) Data Encoding
  • (D) Data Transformation

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Q. What is the primary goal of dimensionality reduction techniques in data modeling?

  • (A) To increase model complexity
  • (B) To improve model accuracy
  • (C) To reduce dimensionality
  • (D) To calculate summary statistics

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Q. In data modeling, what is the term for the process of selecting a subset of data for model training and testing?

  • (A) Data Sampling
  • (B) Data Cleaning
  • (C) Feature Engineering
  • (D) Data Transformation

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Q. Which data modeling approach is commonly used for representing data as a collection of interconnected nodes in a graph?

  • (A) Relational Modeling
  • (B) Bayesian Network Modeling
  • (C) Graph Database Modeling
  • (D) Entity-Relationship Modeling

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Q. What is the primary purpose of a Bayesian Network in data modeling?

  • (A) To represent the structure of a database
  • (B) To predict probabilities
  • (C) To visualize data relationships
  • (D) To calculate summary statistics

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Q. In data modeling, what is the term for the process of aggregating and summarizing data at different levels of granularity?

  • (A) Data Aggregation
  • (B) Data Cleaning
  • (C) Data Sampling
  • (D) Data Transformation

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Q. What is the primary goal of regression analysis in data modeling?

  • (A) To group similar data points
  • (B) To predict numerical values
  • (C) To improve model accuracy
  • (D) To calculate summary statistics

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Q. What is the primary goal of data modeling in the context of data science?

  • (A) To collect raw data
  • (B) To predict future data
  • (C) To represent and understand data
  • (D) To clean and preprocess data

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Q. In data modeling, what is the term for a visual representation of the relationship between different entities in a database?

  • (A) Data Dictionary
  • (B) Data Flow Diagram (DFD)
  • (C) Entity-Relationship Diagram (ERD)
  • (D) Data Cube

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