Calculate the total cost and expected cost (per email) based on the confusion matrix you obtained in question. Assume the cost for each mis-classified email from Spam to Non-spam is 5, and from Non-spam to Spam is 100. [Hint: be careful with the dimensions of the confusion matrix: which are the "actuals" and which are the "predictions"?]

Which of the following best describes how the federal reserve bank banks during a bank run? a. the federal reserve bank has the power to take over a private bank if customers demand too many withdrawals. b. the federal reserve bank can provide a short-term loan to banks to prevent them from running out of money. c. the federal reserve bank regulates exchanges to prevent the demand for withdrawals from rising above the required reserve ratio. d. the federal reserve bank acts as an insurance company that pays customers if their bank fails. 2b2t

What is the relationship between marginal external cost, marginal social cost, and marginal private cost? a. marginal social cost equals marginal private cost plus marginal external cost. b. marginal private cost plus marginal social cost equals marginal external cost. c. marginal social cost plus marginal external cost equals marginal private cost. d. marginal external cost equals marginal private cost minus marginal social cost. marginal external cost a. is expressed in dollars, so it is not an opportunity cost b. is an opportunity cost borne by someone other than the producer c. is equal to two times the marginal private cost d. is a convenient economics concept that is not real

Hundreds of a bank's customers have called the customer service call center to complain that they are receiving text messages on their phone telling them to access a website and enter personal information to resolve an issue with their account. what action should the bank take?