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

1. Why is min-max scaling applied before using algorithms like K-Nearest Neighbors or SVM?

A) To make all features interpretable as binary values
B) To compress all values into integers
C) To convert strings into numeric values
D) To prevent features with larger scales from dominating distance calculations

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

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

3. Which file format is most suitable for exchanging large tabular datasets with consistent column data types across systems?

A) .json
B) .xml
C) .csv
D) .txt

4. What is a best practice when organizing data in a spreadsheet for analysis?

A) Place charts in the middle of data tables
B) Merge cells to reduce redundancy
C) Apply conditional formatting to entire rows only
D) Use consistent column headers across all sheets

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

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

Solutions: