DAC Data Tools and Visualization 1

Question 1

What is SQL and why is it essential for data analysts?

Accepted Answer

Structured Query Language — the standard language for querying, manipulating, and managing relational databases

Answer

A spreadsheet application

Answer

A data visualization tool

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A programming language for websites

Question 2

When should you use a bar chart versus a line chart?

Accepted Answer

Bar charts for comparing categories; line charts for showing trends over time

Answer

They are interchangeable for all data types

Answer

Bar charts only for financial data

Answer

Line charts only for scientific data

Question 3

What is a dashboard in data analytics?

Accepted Answer

An interactive visual display of key metrics and KPIs, providing at-a-glance monitoring of business performance

Answer

A car's instrument panel

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A social media profile page

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A project management timeline

Question 4

What is Python's role in data analytics?

Accepted Answer

A versatile programming language with libraries (pandas, NumPy, matplotlib) for data manipulation, analysis, and visualization

Answer

A type of database

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A spreadsheet formula language

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A data storage format

Question 5

What is A/B testing in data-driven decision making?

Accepted Answer

Comparing two versions of something (webpage, email, feature) by randomly assigning users to each version and measuring outcomes

Answer

Testing version A before version B chronologically

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Grading tests on an A/B scale

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Alternating between two strategies daily

Question 6

What is data storytelling?

Accepted Answer

Combining data, visuals, and narrative to communicate analytical findings effectively to stakeholders

Answer

Writing fictional stories about data

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Reading data reports aloud in meetings

Answer

Creating animated data presentations