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

1. What is the primary difference between the == operator and the is operator in Python when used in a data pipeline?

A) is checks value equality, while == checks for data type compatibility
B) is compares dictionary keys, while == compares keys and values
C) == compares values for equality, while is checks for object identity
D) == checks identity, while is compares memory addresses

2. Which of the following statistical measures are considered measures of central tendency?
(Choose two)

A) Mode
B) Mean
C) Interquartile range
D) Variance

3. What is the primary reason for converting all categorical labels to lowercase during the data cleaning process?

A) To reduce memory usage in the dataset
B) To make string comparison operations slower
C) To avoid treating the same category as different due to case differences
D) To improve data visualization aesthetics

4. Which two benefits are most closely associated with using object-oriented programming (OOP) in data analysis pipelines?
(Choose two)

A) Encourages code reuse through inheritance and modularity
B) Allows the use of lambda for procedural logic
C) Supports clearer abstraction by modeling real-world entities
D) Enables procedural programming only through decorators

5. When working with relational databases in Python, what are key components required to establish and manage database connections?
(Choose all that apply)

A) Connection object to interface with the database
B) Cursor object for executing queries
C) Python's random module for generating keys
D) Database driver or module (e.g., sqlite3)

Solutions: