Which is not a limitation associated with longitudinal research? the aging of the participants losing participants over time changing historical context participants becoming aware of the goals of the study and changing their behaviors or answers

The answer is - changing historical context

Step-by-step explanation:

Longitudinal research is a research that involves studies involving the same individuals and observing them to understand the long term effects of changes in products, environment on behavior, attitude, etc.

This research can extend over a period of decades.

The answer is - changing historical context

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.