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Python Institute Certified Associate Data Analyst with Python (PCAD-31-02) Sample Questions:

1. How would you extract the last three rows of a DataFrame df using position-based indexing?

A) df.iloc[-3:]
B) df.loc[-3:]
C) df[-3]
D) df.tail(3)

2. Which of the following correctly demonstrates the use of parameterized queries using Python's sqlite3 module?

A) cursor.execute("SELECT * FROM users WHERE id = ?", user_id)
B) cursor.execute("SELECT * FROM users WHERE id = ?", (user_id,))
C) cursor.execute("SELECT * FROM users WHERE id = ':id'", {'id': user_id})
D) cursor.execute("SELECT * FROM users WHERE id = " + user_id)

3. When performing bootstrapping on a dataset with 500 observations, what is a typical procedure?

A) Drawing one sample and calculating the mean only once
B) Creating samples by removing all duplicates
C) Scaling all values between 0 and 1 before resampling
D) Generating multiple datasets of the same size by randomly sampling with replacement

4. What is the main reason for using try-except blocks in a data analysis script that reads multiple files?

A) To ensure functions always return None
B) To automatically restart the script after execution
C) To enforce strict type annotations
D) To gracefully handle runtime errors without crashing the program

5. What distinguishes structured data from unstructured data in the context of data modeling and storage?

A) Structured data follows a consistent schema or format
B) Unstructured data cannot be stored or analyzed
C) Unstructured data contains only numeric values
D) Structured data cannot be stored in databases

Solutions: