Answer:
A hypothesis is a testable statement that is proposed to explain an observation/theory. In this case, one hypothesis that could be used is: Taller people have longer arms than smaller people. You could also say: As the height of an individual increases, the length of their arms also increases.
Independent variables are the variable that is manipulated. In this case, the independent variable is the height of the individual.
Dependent variables are those that change in response to the independent variable. In this case, the dependent variable is arm length.
