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

1. What does a Pearson correlation coefficient value of -0.9 imply about the relationship between two numerical variables?

A) A moderate non-linear association
B) A strong negative linear relationship
C) No correlation
D) A weak positive relationship

2. What is the best approach when comparing SQL NULL values with Python data during conditional checks?

A) Replace NULL with zero before importing
B) Use Python's None and SQL's IS NULL clause
C) Use == None directly in SQL queries
D) Convert all NULL to string before comparison

3. Which SQL commands are typically used to retrieve and manipulate data in a data analysis context?
(Choose all that apply)
Response:

A) UPDATE
B) ROLLBACK
C) SELECT
D) INSERT

4. 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) == checks identity, while is compares memory addresses
D) == compares values for equality, while is checks for object identity

5. In supervised learning, what is the primary goal when training a model on labeled data?

A) To cluster data points into similar groups
B) To learn a function that maps inputs to known outputs
C) To discover hidden patterns without outputs
D) To analyze unstructured data formats like text

Solutions: