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

1. Which of the following are true characteristics of bootstrapping in statistics?
(Choose two)

A) It uses random sampling with replacement
B) It requires a large population sample
C) It assumes a normal distribution
D) It enables confidence interval estimation

2. Which SQL command should a data analyst use to modify existing records in a database table based on specific conditions?

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

3. When performing bootstrapping on a dataset with 500 observations, what is a typical procedure?

A) Generating multiple datasets of the same size by randomly sampling with replacement
B) Drawing one sample and calculating the mean only once
C) Creating samples by removing all duplicates
D) Scaling all values between 0 and 1 before resampling

4. Which practices are essential to ensure a fair evaluation of a machine learning model's performance?
(Choose two)

A) Randomizing the test dataset labels
B) Using cross-validation to assess generalizability
C) Splitting data into training and test sets
D) Training on the entire dataset including test records

5. Which methods can be used to validate data types and structure in a Pandas DataFrame?
(Choose two)

A) df.info()
B) df.to_csv()
C) df.memory_usage()
D) df.dtypes

Solutions: