Question

which statement is the best example of a valid hypothesis?

people should eat vegetables.

if i add substance x, then it will lower the temperature at which water freezes.

children like brand x peanut butter better than brand y peanut butter.

bananas are better for you than chocolate.

Explanation:

A valid hypothesis is a testable prediction with an "if - then" structure (or can be framed that way) and is based on scientific inquiry.

• "People should eat vegetables" is a recommendation, not a hypothesis.
• "If I add substance X, then it will lower the temperature at which water freezes" has an "if - then" structure, is testable (we can add substance X and measure water's freezing point), so it's a valid hypothesis.
• "Children like brand X peanut butter better than brand Y peanut butter" is an observation/statement, not a hypothesis (it's a claim about preference, but not a testable prediction in the hypothesis format).
• "Bananas are better for you than chocolate" is a subjective comparison, not a testable hypothesis.

Answer:

B. If I add substance X, then it will lower the temperature at which water freezes.