Assume there are no prospective investment projects (I) which will yield an expected rate of return (r) of 25 percent or more, but that there are $5 billion of investment opportunities with an expected rate of return between 20 and 25 percent, an additional $5 billion between 15 and 20 percent, and so on.The investment-demand curve for this economy is: 
Definitions:
Degrees of Freedom
Refers to the number of independent values or quantities that can vary in a statistical analysis without breaking any constraints.
ANOVA F Test
A statistical test used in analysis of variance (ANOVA) to determine if there are significant differences between the means of three or more groups.
Explanatory Variables
Variables in a statistical model that are used to explain variations in the dependent variable.
Multiple Regression
A statistical technique used to predict the outcome of a dependent variable based on multiple independent variables.
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