The scatter plot and residual plot shown below is from a regression analysis of Prehistoric Native American projectile points. The widths of the projectiles were regressed on the length of the projectile points. 
Using these plots categorize each of the Basic Assumptions of the simple linear regression model as one of the following:
a) Not checkable
b) Checked and met
c) Checked and not met
For all assumptions checked, explain what aspect of the graphs led you to your conclusion that the assumption was met or not met.
Definitions:
Compounded Annually
A method of calculating interest in which the interest earned each year is added to the principal, so that the balance doesn't merely grow, it grows at an increasing rate.
Present Value
The present value of a future amount of money or sequence of cash flows, based on a certain rate of return.
Notes Payable
Short or long-term financial obligations evidenced by promissory notes, requiring the borrower to repay the principal amount along with any accrued interest.
Market Interest Rate
The prevailing rate of interest available in the marketplace for securities of similar risk and maturity.
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