Two models, A and B, were created, fitted to the data, and tested on the test set. Both models’ R2 and RMSE are shown below. Model A: R² = 0.58, RMSE = 22 Model B: R² = 0.55, RMSE = 19 Which statement is most accurate?

A histogram of order_value shows most orders between $10–$80, but a long tail reaching $1,500. Which of the options provides the best interpretation?

Why do we split data into train and test sets?

You’re predicting future customer_spend_next_month. Which feature is most likely problematic due to leakage?

spring_26_182__exam1_makeup.pdf

You load a CSV and run the head(3) method to see the top few rows of data. You see: df[“revenue”].head() #0  “$1,250.00” #1  “$980.50” #2  None #3  “$2,100.00” Which approach most directly converts revenue into a numeric column (float) with missing values preserved as NaN?

Your transaction table should have one row for each combination of order_id and line_item_id. In other words, multiple rows can have the same order_id, and multiple rows can have the same line_item_id; but no two rows should have the same order_id and the same line_item_id. What is the best check?

A 50.0 g ball traveling horizontally at 32.0 m/s rebounds off a wall in the opposite direction at 24.0 m/s. If the collision with the wall took 2.50×10-3 s, what was the force exerted on the ball?

A 6.0 kg object traveling East at 18 m/s collides elastically with a 3.0 kg object traveling West at 24 m/s. What is the speed of the 6.0 kg object after the collision?

A company on LinkedIn wants to directly message professionals based on their job titles and industries to promote an event. Which feature should it use?