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

1. Which SQL commands can be used to modify the contents of a table's data directly?
(Choose all that apply)

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

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

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

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

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

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

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

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

Solutions: