Using the concept of overfitting, explain why when a model is fit to training data, zero error with those data is not necessarily good

The new york stock exchange is an example of physical or individual

Classifying inflows and outflows of cash classify each of the following items as an inflow (i) or an outflow (o) of cash, or as neither (n). lg 2 lg 2 item change ($) item change ($) cash +100 accounts receivable −700 accounts payable −1,000 net profits +600 notes payable +500 depreciation +100 long-term debt −2,000 repurchase of stock +600 inventory +200 cash dividends +800 fixed assets +400 sale of stock +1,000

Employees at a library check out books to patrons. books have an isbn and a name. the library sometimes has multiple copies of the same book. books have one or more authors. a patron is an individual who has an active (non-expired) library card. for each library card, we store the person's first and last names and their address. for each employee, we store their employee id, current salary, first and last name and their address. we also store the employee id of their current manager. each time we check out a book to a patron we need to store the date of the transaction, the employee who checked out the book to the patron, and the library card of the patron. some employees have library cards. if an employee patron turns in a book late, the fine that they pay is a percentage of their salary. some employees are authors who have library cards—they are allowed to check out as many books as they like.