Specificity, a measure of classification accuracy, reflects: (regard class 1 as yes and class 2 as no) a. the portion of observations that are actually in class 2 that are classified as being in class 1. b. the portion of observations that are actually in class 1 that are classified as being in class 1. c. the portion of observations that are classified as class 1 that are actually in class 1. d. the portion of observations that are actually in class 2 that are classified as being in class 2.

Which of the statements best describes why the aggregate demand curve is downward sloping? an increase in the aggregate price level causes consumer and investment spending to fall, because consumer purchasing power decreases and money demand increases. as the aggregate price level increases, consumer expectations about the future change. as the aggregate price level decreases, the stock of existing physical capital increases. as a good's price increases, holding all else constant, the good's quantity demanded decreases.