Both examples include two statements from the script of the scene about reaction times in baseball.
The first is Malik’s hypothesis that “Boys are better at hitting fastballs than girls because boys have faster reaction times.” This statement has both elements.
It’s important that students recognize that regardless of our feelings or experiences, a statement that contains the essential elements is indeed a scientific hypothesis.
The second model includes Stephanie’s statement that “They lost because everybody has a bad day now and then.” While this statement has a view that Stephanie believes is true, the reason or cause cannot be tested with a measurement. Some students may insist that this can be tested with a measurement. If they do, encourage them to think about how they would measure having a bad day “now and then.” While Stephanie’s statement may be true, it cannot be a scientific hypothesis because it lacks the second element.
There are other correct ways to frame a hypothesis, such as using an if/then statement.
See here for an explanation of this alternate structure as well as an introduction to the terms dependent and independent variable.