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

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

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

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

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

3. Which of the following statistical measures are considered measures of central tendency?
(Choose two)

A) Variance
B) Mean
C) Interquartile range
D) Mode

4. Why is it important to use a test dataset separate from the training dataset when evaluating a machine learning model?

A) To optimize the model's training accuracy
B) To ensure the loss function is minimized
C) To evaluate the model's performance on unseen data
D) To reduce the number of iterations during training

5. What is the primary reason for converting all categorical labels to lowercase during the data cleaning process?

A) To improve data visualization aesthetics
B) To reduce memory usage in the dataset
C) To make string comparison operations slower
D) To avoid treating the same category as different due to case differences

Solutions: