A group of teachers wants to determine whether using educational games improves students' vocabulary in English. They divide 60 students into two groups. One group uses educational games during classes, while the other follows the traditional teaching method. After one month, both groups take the same vocabulary test., Experimental research, Non-experimental research, A researcher wants to investigate whether there is a relationship between students' sleeping habits and their academic performance. She collects information from 300 university students through questionnaires and compares their sleeping hours with their grades, without changing their routines., Experimental research, Non-experimental research, A researcher visits three schools to observe how teachers use technology during English lessons. She records the activities without changing the teachers' methods., Experimental research, Non-experimental research, A researcher wants to investigate whether using flashcards improves students' English vocabulary. One group uses flashcards for four weeks, while another group studies with their regular materials. Both groups take a vocabulary test before and after the experiment., Experimental research, Non-experimental research, An English teacher wants to know if watching short videos improves listening comprehension. She uses videos with one group for six weeks, while another group continues using the regular textbook. At the end, both groups take the same listening test., Experimental research, Non-experimental research, A researcher interviews university students to understand why they feel nervous when speaking English in front of their classmates. She collects their answers without applying any new teaching method., Experimental research, Non-experimental research

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