Answer:
Jerome's inference is invalid because his sampling technique is not random, and it may be biased.
Explanation:
A valid inference should survey a sufficiently large random sample from the school population.
A minimum sample size of 30 is recommended.
A class of math students may have habits, likes, and dislikes that are not representative of the school population.
A form of sampling such as simple or systematic sampling is more likely to yield credible inferences.