A university administrator wants to determine the average GPA of all undergraduate students at the university. To do this, the administrator obtains a list of all students on the Dean's List (students with a GPA of 3.5 or higher) and randomly selects 200 students from this list to calculate their GPAs. Which of the following is true about the administrator's method?
The method is unbiased because students were randomly selected.
The sample is representative of all high-achieving students at the university.
The sample is biased because it only includes students with high GPAs, not representative of all undergraduate students.
The sample size of 200 is too small to accurately determine the average GPA of all undergraduate students.
