If a researcher watches one-week-old babies and records how many times they open and close their eyes while lying in their cribs, he is most likely using:

If a researcher watches one-week-old babies and records how many times they open and close their eyes while lying in their cribs, he is most likely using "scientific observation."

Scientific observation is utilized for testing the clear expectations of a scientific theory. On the off chance that the perceptions discredit these expectations, the theory moves toward becoming distorted and therefore it ought to be adjusted or deserted.  

Scientific observation is the central component of logical strategy or process. The center expertise of researcher is to mention objective fact. Observation comprises of getting learning of the outside world through our faculties, or recording data utilizing logical apparatuses and instruments. Any information recorded amid an analysis can be called an observation.

the median of the data is 4.

step-by-step explanation:

the median means the middle number of a given number.

to decide which one is the median, arrange in ascending or descending order. but sometimes, you may find two(2) number in the middle, but it's easy, just add them together and divide by 2.

so,   determine the median of the data. 2, 3, 3, 4, 5, 7, 9

it is already arranged, count 3 times forward and 3 backward and the one left is your answer.

2,3,3,4,5,7,9

our answer is 4.

hope this !