Final answer:
Elton should use Descriptive research to examine the number of students who wake up early, as it provides systematic descriptions of phenomena. If causality is of interest, he would need to conduct a Field experiment or Causal research instead.
Step-by-step explanation:
The most suitable method for Elton, a math teacher, who decides to examine the number of students who wake up early is Descriptive research. This type of research is aimed at providing accurate and systematic descriptions of phenomena, without necessarily determining cause and effect relationships. It could include collecting information about the students' wake-up times and summarizing this data to understand patterns or average wake-up times among the student population.
For example, Elton might collect wake-up times through surveys or questionnaires and then use statistics to describe and summarize this data. By understanding the wake-up patterns of students, Elton could potentially draw conclusions or make inferences about factors such as sleep habits and academic performance. However, it is important to note that without a controlled experiment, it would be difficult to make causal claims about the relationship between waking up early and students' performance or well-being.
If Elton wanted to establish causality, he would have to conduct a Field experiment or Causal research, which involves manipulating one or more variables to determine their effect on a certain outcome. Descriptive research, meanwhile, would not involve such manipulation and would be more focused on observation and reporting.