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

Question 1

What is a good example of a message to accompany a commit?

• ✅ Modified linear model of height to include new covariate, genotype

• ❌ Fixed problem with linear model

• ❌ Updated thing

Explanation:
A good commit message should be clear, specific, and descriptive of the change. “Modified linear model…” clearly states what was changed and why, making version history understandable later.

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Question 2

On each repository page in GitHub, in the top right corner there are three options. They are:

• ✅ Watch, star, fork

• ❌ Pull, clone, fork

• ❌ Commit, contributors, issues

Explanation:
GitHub repositories show Watch (notifications), Star (favorite/bookmark), and Fork (copy repository to your account) options. These are standard GitHub repo actions.

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Question 3

Which of the following will initiate a git repository locally?

• ✅ git init

• ❌ git remote add

• ❌ git boom

Explanation:
git init initializes a new local Git repository.
git remote add connects an existing local repo to a remote one, and git boom is not a Git command.

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Question 4

What is the correct order of commands to send a file to GitHub from within RStudio?

• ❌ Commit > Push

• ✅ Stage > Commit message > Commit > Push

• ❌ Pull > Push > Commit

Explanation:
The proper Git workflow is:
1️⃣ Stage the changes →
2️⃣ Write a descriptive commit message →
3️⃣ Commit the changes locally →
4️⃣ Push them to GitHub.
Skipping “Stage” means nothing gets committed.

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Question 5

How do you add all of the contents of a directory to version control?

• ✅ git add .

• ❌ cd ~/dir/name/of/path/to/file

• ❌ git commit -m “Message”

Explanation:
git add . stages all files and folders in the current directory for commit.
cd only changes directories, and git commit records changes that have already been staged.

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🧾 Summary Table

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