Online Access Free PCAD-31-02 Exam Questions

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

Which techniques are most effective when designing reusable and testable functions in Python?
(Choose two)

• A.Use of default parameters
• B.Creating large monolithic functions
• C.Returning print statements instead of values
• D.Avoiding external state or side effects

Which of the following would best validate the uniqueness of a primary key in a Pandas DataFrame?

• A.df['id'].nunique()
• B.df['id'].duplicated().any()
• C.df['id'].fillna()
• D.df['id'].isnull().sum()

Which command should a data analyst use to install the pandas library in a Python environment using the Python Package Index?

• A.python install pandas
• B.pip install pandas
• C.install pip pandas
• D.python get pandas

When analyzing a dataset of customer ages, you calculate the mean, median, and mode. What does it indicate if all three values are approximately equal?

• A.The dataset is positively skewed
• B.The dataset is uniformly distributed
• C.The dataset contains outliers
• D.The dataset has a normal distribution