Answer:
a. Undercoverage bias
Explanation:
Based on the information provided within the question it can be said that the bias being mentioned is Undercoverage bias. This refers to when a population of a sample are not being represented correctly, which in this scenario is because these people cannot be contacted. Therefore the correct bias that results from this is Undercoverage bias.
Answer:
The answer is false it has not
Answer:
I think its B hope it helps ! Good luck
Explanation: