FREE Data Science Knowledge Questions and Answers

Question 1

Which of the following sums up data science's main objective the best?

Accepted Answer

To mine and analyze large amounts of data in order to uncover information that can be used for operational improvements and business gains.

Answer

To collect and prepare data for use as part of analytics applications.

Answer

To collect and archive exhaustive data sets from various source systems for corporate record keeping uses

Question 2

What is the process's initial stage in data science?

Accepted Answer

Defining an analytical hypothesis that could provide business value

Answer

Collecting data and preparing it for analysis

Answer

Experimenting with and tuning different analytical models

Question 3

What distinguishes a data scientist from a data engineer, in the main?	What distinguishes a data scientist from a data engineer, in the main?

Accepted Answer

A data engineer builds data pipelines and helps prepare data, while a data scientist is responsible for data collection, preparation and analysis.

Answer

A data engineer analyzes data after a data scientist collects and prepares it.

Answer

A data engineer collects and prepares data, and a data scientist then analyzes it.

Question 4

Which programming language is most frequently used by data scientists among the following?

Accepted Answer

Python, R and SQL

Answer

Java and Javascript

Answer

C and C++

Question 5

What is the main distinction between supervised and unsupervised learning in machine learning?

Accepted Answer

Supervised learning involves data that has been labeled and classified, while unsupervised learning data is unlabeled and unclassified.

Answer

Supervised learning is monitored closely by data scientists, while they don't play a role in unsupervised learning.

Answer

Supervised learning is only used for image recognition, while unsupervised learning can be used for various analytics applications.

Question 6

What makes data scientists benefit from data sampling?

Accepted Answer

It enables them to use a representative subset of data to build accurate analytical models more quickly.

Answer

It lets them analyze data sets in small batches to reduce their use of system resources

Answer

It reduces the amount of data storage space that's required for data science applications.

Question 7

What is a widely held belief regarding data scientists?

Accepted Answer

They spend 80% of their time finding and preparing data and 20% analyzing it.

Answer

They spend 80% of their time on failed analytics projects and 20% doing useful work.

Answer

They spend 80% of their time analyzing data and 20% finding and preparing it.

Question 8

Select the option that centers around identifying unknown properties in the data from the list below.

Accepted Answer

Data mining

Answer

Machine learning

Answer

Data wrangling

Answer

Big data

Question 9

Choose the model that serves as the industry standard for data analysis.

Accepted Answer

Casual

Answer

Decriptive

Answer

Inferential

Answer

All of the above

Question 10

Select the appropriate use of data science in healthcare from the list below.

Accepted Answer

All of the above

Answer

Drug discovery with data science

Answer

Data science for genomics

Answer

Data science for medical imaging