MS-DS Master of Data science FREE Master of Data Science Questions and Answers 3

Question 1

Which dimensionality reduction technique preserves the global variance structure of the data by projecting it onto orthogonal components?

Accepted Answer

Principal Component Analysis (PCA)

Answer

PCA finds orthogonal axes that maximize variance, making it ideal for linear dimensionality reduction while preserving the overall data structure.

Question 2

In a data science graduate program, what does ETL stand for in the context of data engineering?

Accepted Answer

Extract, Transform, Load

Answer

ETL stands for Extract, Transform, Load, which describes the process of pulling data from sources, cleaning and reshaping it, and storing it in a target system.

Question 3

Which type of neural network architecture is best suited for sequential data such as time series or natural language?

Accepted Answer

Recurrent Neural Network (RNN)

Answer

RNNs are designed to handle sequential data by maintaining a hidden state that captures information from previous time steps in the sequence.

Question 4

What is the main advantage of using ensemble methods like Random Forest over a single decision tree?

Accepted Answer

They reduce overfitting by averaging predictions from multiple trees

Answer

Random Forests aggregate predictions from many decision trees trained on random subsets, which reduces variance and overfitting compared to a single tree.

Question 5

Which probability distribution is commonly used to model the number of events occurring in a fixed interval of time?

Accepted Answer

Poisson distribution

Answer

The Poisson distribution models the probability of a given number of events happening in a fixed time period when events occur independently at a constant rate.

MS-DS Master of Data science Practice Test

MS-DS Master of Data science Practice Test

MS-DS Master of Data science FREE Master of Data Science Questions and Answers 3