Module Two Summative Quiz:The Data Scientist’s Toolbox(Data Science Specialization):Answers2025

Question 1

What does base R focus on?

• ❌ Mapping

• ✅ Statistical analysis

• ❌ Artificial intelligence

Explanation:
Base R was originally built for statistical computing and graphics — it includes tools for data analysis, probability, hypothesis testing, and visualization (like plot() and lm()).

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Question 2

What is RStudio?

• ✅ A graphical user interface for R

• ❌ Version control software

• ❌ A programming language

Explanation:
RStudio is an IDE (Integrated Development Environment) that provides a user-friendly interface to write, run, and manage R code — including console, script editor, plots, and environment panes.

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Question 3

What is the name of the quadrant in the bottom left corner of RStudio (default layout)?

• ❌ History

• ❌ Plots

• ✅ Console

Explanation:
The Console pane (bottom left by default) is where your R commands are executed. You can type code directly there and see immediate output or errors.

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Question 4

What command lists your R version, operating system, and loaded packages?

• ❌ versions()

• ❌ Sessioninfo()

• ✅ sessionInfo()

Explanation:
The correct built-in function is sessionInfo() — it prints details about your R version, OS, locale, and attached packages, useful for reproducibility and troubleshooting.

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Question 5

What file extension do Projects in R use?

• ✅ .Rproj

• ❌ .R

• ❌ .RPROJECT

Explanation:
RStudio project files use the .Rproj extension. Opening one restores your working directory, environment, and files exactly as when last closed — keeping projects isolated.

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🧾 Summary Table

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