A researcher in a gym setting counts the number of times that individuals look at themselves in a mirror while they exercise during a 30-minute observation period. What method did the researcher use...

A researcher in a gym setting counts the number of times that individuals look at themselves in a mirror while they exercise during a 30-minute observation period. What method did the researcher use to quantify her observations?

A researcher plays a video of an interview and records the behavior of the interviewer, then replays the video and records the behavior of the interviewee. What sampling method did the researcher use to manage the observational period?