The coefficient of determination is the proportion of the variation that is not explained by the regression model

What was the name of the plan, enacted in 2011, in which the Fed bought $400 billion worth of long-term securities while selling $400 billion worth of short-term securities?

A) Operation Go Long B) Operation Twist C) QE2 D) QE3

The above figure shows the payoff to two firms in an industry deciding to make an investment in worker safety. Neither firm will make the investment because

A) each can benefit from the other firm incurring the costs. B) there is no benefit to making the investment. C) each firm pays for the other firm's investment. D) society does not care about worker safety.