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A researcher studies digital distraction by recording how many times students look away from a reading passage to check notifications during a 20-minute session. What is the operational definition of digital distraction in this study?

Two trained coders independently watch the same video clips of group discussions and rate how often each person interrupts another speaker. The researcher checks whether the coders give similar ratings. Which type of reliability is being evaluated?

A research team wants to observe leadership during team meetings. Which coding rule would best support interrater reliability while still measuring leadership behavior?

A company introduces a leadership-training program. Three months later, employee productivity is higher than it was before the program. During the same period, the company also hired additional staff to reduce workload. Which issue should a researcher consider?

A student believes group projects are always ineffective. When writing a blog post, the student searches only for stories about failed group projects and skips articles describing mixed or positive outcomes. Which bias is most clearly involved?

A researcher assigns participants to complete a planning worksheet before a group task and then measures task completion afterward. Which causal criterion is addressed by making sure the worksheet comes before the outcome?

Researchers observe how preschool children learn the meaning of new words after hearing them in different sentence contexts. What feature most strongly suggests that this is basic research?

A researcher has a theory that interruptions make it harder for people to keep information active in memory. Which statement is the best example of a testable hypothesis based on this theory?

In a study of decision-making, all participants watch the same two-minute instruction video before completing a choice task. Researchers then record each participant’s decision time and confidence rating. Which part of the study is a constant?

A researcher wants to measure people’s confidence in using a new home blood-pressure monitor. Which measure would be the weakest operational definition of confidence?