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

1. Which characteristics are commonly associated with cloud-based data storage solutions?

A) Elastic scalability
B) High availability and redundancy
C) Physical proximity to user machines
D) Requires dedicated local hardware

2. What is the correct SQL statement to permanently remove a table named customers from a database?

A) REMOVE TABLE customers;
B) TRUNCATE TABLE customers;
C) DELETE TABLE customers;
D) DROP TABLE customers;

3. Which method is appropriate for combining two DataFrames based on a shared key column where non-matching rows should be excluded from the result?

A) merge(..., how='inner')
B) append()
C) join(..., how='outer')
D) concat()

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

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

5. What is the main purpose of using the bootstrapping technique in inferential statistics?

A) To validate the syntax of SQL queries in Python
B) To filter outliers from a dataset
C) To estimate the sampling distribution by resampling with replacement
D) To increase the number of features in a model

Solutions: