Your question is Detecting Bias in Customer Surveys. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You're reviewing customer survey results and want to know whether the responses reflect the full customer base or a skewed subset. You need to assess whether the survey itself is biased.
How would you determine whether a customer survey is biased?