Question

administering a survey to pacifists only is used in the video as an example of
how phrasing questions can be \tricky\.
random sample
sampling bias
representative sampling

Explanation:

Sampling bias occurs when a sample is not representative of the entire population, as it excludes or overrepresents certain groups. Surveying only pacifists excludes non-pacifists, creating an unrepresentative sample. Random and representative sampling aim for broader, unbiased groups, and this example does not relate to question phrasing.

Answer:

sampling bias