If the degree of excess capacity decreases at the same time nominal interest rates decrease, in the short-run we can expect that

aggregate demand will shift right increasing output and employment.

aggregate demand will shift left increasing output and employment.

aggregate demand will shift right decreasing output and employment.

aggregate supply will shift left decreasing output and employment.

aggregate supply will shift right increasing output and employment. (wrong)

The difference of sample means of two populations is 55.4, and the standard deviation of the difference of sample means is 28.1. which statement is true if we are testing the null hypothesis at the 95% confidence level? a. the difference of the two means is significant, so the null hypothesis must be rejected. b. the difference of the two means is significant, so the null hypothesis must be accepted. c. the difference of the two means is not significant, so the null hypothesis must be rejected. d. the difference of the two means is not significant, so the null hypothesis must be accepted.