Module 1 challenge:Prepare Data for Exploration (Google Data Analytics Professional Certificate) Answers 2025

Question 1

Which of the following items are examples of structured data?

✅ Price list
✅ Data table
❌ Audio recording
❌ Scanned medical images

Explanation:
Structured data is organized and stored in predefined formats (like tables, spreadsheets, or databases).

• Price lists and data tables fit that.

• Audio recordings and images are unstructured because they lack a consistent format.

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Question 2

The number of stars awarded to a product review is an example of _____ data.

✅ discrete
❌ continuous
❌ nominal
❌ open

Explanation:
Discrete data can take specific values (like 1, 2, 3, 4, 5 stars). It cannot be divided meaningfully between numbers (e.g., 3.5 stars isn’t always possible).

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Question 3

Which statements describe first-, second-, and third-party data?

✅ First-, second-, and third-party data should all be checked for accuracy before use.
✅ First-party data is collected by an individual or group using their own resources.
✅ Third-party data comes from outside sources.
❌ Second-party data is often less reliable than third-party data.

Explanation:

• First-party = collected directly by you

• Second-party = obtained from a trusted partner

• Third-party = purchased from external aggregators
  All must be verified for reliability and accuracy before use.

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Question 4

A data analyst works on an urgent traffic study. What type of data might yield the best results?

✅ Historical
❌ Theoretical
❌ Fabricated
❌ Unclean

Explanation:
When time is short, using historical (existing) data saves effort and provides reliable real-world insights quickly.

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Question 5

Studying a smaller group representing a larger population describes:

✅ Using a sample
❌ Using a population
❌ Choosing a data type
❌ Choosing quantitative data

Explanation:
A sample is a subset of a population used for analysis when surveying everyone is impractical.

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Question 6

Which are examples of continuous data?

✅ Temperature of a swimming pool
✅ Duration of a customer service call
❌ Number of employees at a company
❌ Favorite social media platform

Explanation:
Continuous data can take any value within a range (e.g., time, temperature).
Discrete (like number of employees) and qualitative (like favorite platform) are not continuous.

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Question 7

What type of data is contained in the spreadsheet?

✅ Long
❌ Tall
❌ Wide
❌ Unstructured

Explanation:
Each row is a single observation (customer-year) — this is known as long format data, ideal for time series or repeated measures.

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Question 8

Which question collects nominal qualitative data?

✅ Did anyone recommend our music lessons to you?
❌ How many minutes long is your commute?
❌ How many times do you exercise each week?
❌ What is your shoe size?

Explanation:
Nominal data is categorical with no numeric meaning — “Yes/No” responses are nominal qualitative data.

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Question 9

A social media company records whether users shared a post (Yes/No). What data type is this?

✅ Boolean
❌ String
❌ Text
❌ Numerical

Explanation:
A Boolean variable has only two possible values — True/False or Yes/No.

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