Please help!

3. Consider the simple bivariate regression model specification: YZo + lX+8 _ The formula for the 5 standard error of the slope coefcient is Sh,1 = ' . (A word about notation: Minitab uses '15 ;(Xi '2)2 s to mean 5:. In class, I use 5 and se interchangeably.) (1) (a) Provide a simple, generic name for the right-hand-side item that is in the denominator and under the radical sign. (The name is captured by the operations taking place in the item itself.) (2) (b) Is it in the modeler's interest for the individual Xes to have small variability around i or a lot of variability around i ? (2) (c) Let the value of scbe xed. Given your answer in part (b) and relative to the other choice in part (b), what happens to sbl under these circumstances