I dig some deep digging and found this paper
http://pubs.acs.org/doi/abs/10.1021/ja00252a029 by Stille. In it, they do a bunch of Stille couplings and one of them gives a mix of 4-(2-Propenyl)acetophenone #4 and (E)-4-(l-propenyl)acetophenone
#5. Our guess for your HW is #4.
1H NMR (270 MHz)
7.89 (d, J = 8.3 Hz, 2 H, 4), 7.88 (d, J = 8.3 Hz, 2 H, 5), 7.38 (d, J= 8.4 Hz, 2 H, 5),
7.27 (d, J = 8.2 Hz, 4), 6.41 (m, 2 H, 5),
5.94 (m. 1 H, 4),
5.13-5.06 (m, 2 H, 4),
3.43 (d, J = 6.7 Hz, 2 H, 4), 2.57 (s, 3H, 4), 2.53 (s, 3 H, 5), 1.91 (d, J = 5.0 Hz, 3 H, 5).
It fits pretty well, except your benzene ring is at 6.91 not 7.27, and your peaks at 5.1 are doublets unless your squint reeeaaalll hard. Hope this extra info helps.