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

1. Which operation would most efficiently apply element-wise multiplication to two NumPy arrays of equal size?

A) array1 * array2
B) array1.dot(array2)
C) numpy.outer()
D) numpy.matrix()

2. Which chart types are commonly used to represent relationships between two numerical variables in Python-based visualizations?
(choose two)
Response:

A) Histogram
B) Scatter plot
C) Heatmap
D) Line chart

3. What is a key advantage of using the Parquet file format over CSV in large-scale data pipelines?

A) Parquet stores data in plain text, making it human-readable
B) Parquet files can only be used with Excel
C) Parquet supports schema evolution and columnar storage
D) Parquet offers row-based compression

4. Which practices are typically part of the data integration process?
(Choose two)

A) Schema alignment
B) Data encryption
C) Neural network training
D) Format standardization

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

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

Solutions: