Question

which of the following scenarios would give the most accurate data regarding student gpa?
ask the first 50 students that enter the school what their gpa is.
email the student body asking them what their gpa is.
giving students in the lunchroom a form asking them what their gpa is and collecting them to turn them in before they left.
using the student information database to pull a random sample of anonymous student gpas.

Explanation:

• Asking the first 50 students (biased as it's not random).
• Emailing (non - response bias, some may not reply).
• Lunchroom (biased, only those present are surveyed).
• Using database for random sample (reduces bias, more accurate).

Answer:

Using the student information database to pull a random sample of anonymous student GPAs.