Which of the following methods help when a model suffers from high variance? a. Increase training data. b. Increase model size. c. Decrease the amount of regularization. d. Perform feature selection.

What happens if you try to decrease the scale or precision of a NUMBER column to a value less than the data already stored in the field?

Using a graphics program, develop an entity-relationship diagram for a database application for an Internet bookstore where students buy textbooks from a salesperson and receive invoices for their purchases. Use Figure 5.5 as a guide.