Which of the following is(are) not true about sampling bias

Question

a. Sampling bias is inevitable when conducting a survey
b. Quota sampling is still vulnerable to bias
c. Biased samples may trigger some insights or suggest grounds for a new study but they are not generalizable
d. all of the above

Answer 1

They all look true to me. However, if I had to choose one answer, I'd choose a. The word "inevitable" is a clue because most things are not "inevitable."

Answer 2

I would tend to choose all of above. This (a) is the reason why we calculate alpha and beta error. If a is true, then b must be true. Info from biased samples might indicate possible trends in subgroups that need to be explored (c).

I hope this helps. Thanks for asking.