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

1. What is the primary reason for using parameterized queries instead of directly formatting SQL strings in Python?

A) To reduce the number of SQL statements
B) To simplify data encryption
C) To prevent SQL injection vulnerabilities
D) To allow dynamic table creation

2. Which best practices help enhance database security when building Python data analysis pipelines?
(Choose two)

A) Limit database user permissions to only necessary operations
B) Sanitize input by replacing dangerous characters with asterisks
C) Construct queries using f-strings for readability
D) Store credentials securely using environment variables

3. Which actions are considered part of basic data validation tasks in Python using Pandas?
(Choose two)

A) Checking for duplicate rows
B) Sorting the data frame by index
C) Replacing NULL values with placeholders
D) Confirming numeric columns contain only integers

4. Which method is commonly used to handle missing numerical data in a dataset?

A) Filling with the mean or median
B) Dropping all columns
C) Replacing with text labels
D) Multiplying all missing values by zero

5. Which metric is most appropriate for evaluating the accuracy of a classification model?

A) Precision
B) Mean squared error
C) Confusion matrix
D) R-squared

Solutions: