Premise: "A young boy walks with a bucket on top of his head."
Hypothesis: "A young boy is lying down underneath a tree with a cowboy hat pulled down over his head to cover his eyes from the sun."
Do we know that the hypothesis entailed by the premise? Now, let's be accurate as possible. Some thinking first:
A young boy can not walk a tree with a cowboy hat pulled his eyes from the sun. So, the answer is no.