better quality of the cell phones is the correct answer
hope this helps and maybe a brainliest answer?????
Answer:
stable-baseline
Explanation:
In simple words, Design from a solid foundation. A small model wherein an investigator tracks behavior for a prolonged baseline time before starting a medication or other interference; if behavior is consistent over the retrospective, the investigator may be more confident in the operations efficacy.
Thus, from the above explanation we can conclude that the correct answer is stable baseline.
I think it is population.
