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

1. Which file formats are commonly used for hierarchical or nested data structures in data acquisition?
(Choose two)

A) TSV
B) XML
C) CSV
D) JSON

2. What is the main reason to remove duplicate records before performing analysis?

A) It helps increase sample size
B) It ensures training data is intentionally overfitted
C) It avoids converting data to JSON format
D) It reduces redundancy that can skew statistical metrics

3. What is the primary goal of pre-processing data before performing analysis?

A) To ensure the data is clean, consistent, and suitable for modeling
B) To compress datasets for storage efficiency
C) To obscure sensitive information
D) To minimize the number of data points

4. Which metric is most appropriate for evaluating the accuracy of a classification model?

A) Precision
B) R-squared
C) Mean squared error
D) Confusion matrix

5. How would you extract the last three rows of a DataFrame df using position-based indexing?

A) df.iloc[-3:]
B) df[-3]
C) df.loc[-3:]
D) df.tail(3)

Solutions: