Answer
amplitude $3$, period $ 4$, no vertical translation, and phase shift $\frac{1}{2}$ to the right.
Work Step by Step
Given $y=3\ cos[(\frac{\pi}{2}(x-\frac{1}{2})]$, we can find the following: amplitude $3$, period $p=\frac{2\pi}{\pi/2}=4$, no vertical translation, and phase shift $\frac{1}{2}$ to the right.
