Answer:
- Third statement: convenience sampling.
Explanation:
The student used convenience sampling.
The population of the study is the entire population of students of the school.
Since it is time consuming to survey all the students, the high school volunteer student needs to survey a sample.
A systematic random sample would have used a procedure, algorithm, method (a system) to select a random sample. This is not what the student did, thus the first option is incorrect.
A voluntary sampling consits of volunteer people who agree to take part in the study and answer the survey. This isn't either how the sample was choosen, thus the second option is also incorrect.
A convenience sample is when the sample is chosen for the researcher's ease, i.e. convenience. In this case, the student decided to survey only members of his class instead of selecting a representative sample of all the classes. This sample is not random, since not every member of the population has equal chances to be chosen, but it is easy for the student to survey a group that is very close to him. Hence, the third statement is correct.
The was not an statrified sampling (fourth choice), since statrified sampling consists in creating different groups and chosing some members from every group. This is not what the researcher did.
