The negation of "Some students like hockey" is:

Negation concept: The statement "Some students like hockey" means "There exists at least one student who likes hockey."

• Formal negation: The negation of "there exists at least one student who likes hockey" is "there does not exist a student who likes hockey."

• Equivalent phrasing: "There does not exist a student who likes hockey" is equivalent to "No students like hockey" or "Every student does not like hockey."

• Why other choices are wrong: Saying "Some students dislike hockey" does not contradict the original statement because both could be true at once.

• Why other choices are wrong: Saying "Every student likes hockey" or "All students like hockey" asserts a universal positive (everyone likes hockey), which is not the logical negation of "some like hockey."

Conclusion: The correct negation is that no students like hockey (equivalently, every student does not like hockey).