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

What is the format for including a link that appears as blue text in your markdown document?

✅ text that is shown
❌ (link.com)[text that is shown]
❌ (text that is shown)[link.com]

Explanation:
In Markdown, the correct syntax for a hyperlink is:
[display text](URL) → Example: [Google](https://google.com)

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Question 2

Which of the following describes a predictive analysis?

✅ Using data collected in the past to predict values in the future
❌ Finding if one variable is related to another one
❌ Showing the effect on a variable of changing the values of another variable

Explanation:
Predictive analysis uses historical data and models (like regression, ML) to forecast future outcomes.

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Question 3

We collect data on all songs and want to summarize how many are country western, hip-hop, classic rock, or other. What type of analysis is this?

❌ Exploratory
✅ Descriptive
❌ Predictive

Explanation:
Descriptive analysis summarizes and describes features of a dataset (e.g., counts, averages, proportions).

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Question 4

What might a confounder be in an experiment looking at the relationship between the prevalence of white hair and wrinkles?

✅ Age
❌ Socioeconomic status
❌ Sex

Explanation:
Age affects both wrinkles and white hair, making it a confounding variable that influences both factors.

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Question 5

Which one of the following is an example of structured data?

❌ The text from a series of books
❌ Lung x-ray images
✅ A table of names and student grades

Explanation:
Structured data is organized in rows and columns (tables), easily stored in databases — unlike text or images.

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🧾 Summary Table

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