Dr. Gonzalez hypothesizes that students who sleep 4 hours a night will be lower in happiness than students who sleep 8 hours a night. What is Dr. Gonzalez's nullI hypothesis? O There is a significant difference in happiness between students who sleep 4 hours per night and students who sleep 8 hours per night. Students who sleep 8 hours a night will be happier than students who sleep 4 hours a night. O There is no difference in happiness between students who sleep 4 hours per night and students who sleep 8 hours per night. Students who sleep 4 hours a night will be happier than students who sleep 8 hours a night.

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