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

1. Which Python library is most commonly used to establish a connection to a SQLite database and perform SQL operations?

A) sqlite3
B) psycopg2
C) pymysql
D) sqlalchemy

2. When analyzing a dataset of customer ages, you calculate the mean, median, and mode. What does it indicate if all three values are approximately equal?

A) The dataset is uniformly distributed
B) The dataset has a normal distribution
C) The dataset contains outliers
D) The dataset is positively skewed

3. Which Python control structures are commonly used for data filtering and iterative operations in real-world analytics tasks?
(Choose two)

A) match-case statements
B) decorators
C) while loops
D) list comprehensions

4. Which practices help ensure secure and effective execution of SQL queries in Python scripts?
(Choose all that apply)

A) Using string concatenation to insert variables into SQL
B) Employing parameterized statements for user-supplied data
C) Using string formatting to build SQL queries dynamically
D) Wrapping SQL commands in try-except blocks

5. What may occur if a model is evaluated using the same data it was trained on?

A) Data leakage
B) Overfitting
C) Overgeneralization
D) Underfitting

Solutions: