Final answer:
A valid scientific hypothesis must be testable and falsifiable. The statement, 'Rechargeable batteries are better than nonrechargeable batteries,' fails as a valid scientific hypothesis because it lacks specificity and measurable variables.
Step-by-step explanation:
A valid scientific hypothesis must be testable and falsifiable. The statement, 'Rechargeable batteries are better than nonrechargeable batteries,' fails as a valid scientific hypothesis because it lacks specificity and measurable variables. It is a general statement without clear criteria for what constitutes 'better.' To be a valid scientific hypothesis, it would need to be more specific, such as 'Rechargeable batteries last longer than nonrechargeable batteries.' This would allow for a testable experiment to determine the validity of the hypothesis.