Questions: A student is designing an experiment about the factors that affect math grades. Which statement best represents a possible hypothesis for this experiment? A. Students who study more get higher math grades. B. Steve studied math for 1 hour every night and got a grade of 87. C. I think practicing math problems is the most important factor in a student's math grade. D. If students spend at least 1 hour per night studying math, then they will get a grade of 85 or higher.

The answer is D: If students spend at least 1 hour per night studying math, then they will get a grade of 85 or higher.

Explanation for each option:

A. Students who study more get higher math grades.

• This statement is a general observation and lacks specificity. It does not clearly define the variables or the expected outcome in a measurable way.

B. Steve studied math for 1 hour every night and got a grade of 87.

• This statement is an anecdotal observation about a single individual. It does not propose a general hypothesis that can be tested across a broader population.

C. I think practicing math problems is the most important factor in a student's math grade.

• This statement expresses a personal opinion and is not structured as a testable hypothesis. It lacks a clear cause-and-effect relationship and measurable criteria.

D. If students spend at least 1 hour per night studying math, then they will get a grade of 85 or higher.

• This statement is a well-structured hypothesis. It clearly defines the independent variable (time spent studying) and the dependent variable (math grade), and it proposes a specific, testable outcome.