Online Access Free PCAD-31-02 Practice Test

What is the key difference between the .iloc[] and .loc[] accessors when working with Series or DataFrames?

• A..loc[] can only be used on Series
• B..iloc[] allows label-based selection
• C..loc[] does not allow slicing
• D..iloc[] is position-based, while .loc[] is label-based

What is the primary purpose of using annotations in a data visualization?

• A.To replace the need for axes
• B.To enhance interactivity in static plots
• C.To highlight important data points and provide contextual information
• D.To ensure faster rendering in large datasets

What is one potential risk of dynamically constructing SQL queries using string concatenation in Python scripts?

• A.Exposure to SQL injection attacks
• B.Missing foreign key constraints
• C.Increased memory usage
• D.Slower database performance

Which statements correctly describe differences between linear and logistic regression?
(Choose two)

• A.Logistic regression uses the logit function to model relationships
• B.Logistic regression outputs probabilities, while linear regression predicts continuous values
• C.Linear regression requires target variables to be binary
• D.Linear regression applies only to classification tasks

Which function is used to reshape a NumPy array without modifying the original data values?

• A.reshape()
• B.flatten()
• C.resize()
• D.transpose()