An experimental study is conducted examining the relationship between drinking caffeine and reaction time. participants given caffeine by the experimenters in different amounts, and then are assessed on various tests of reaction time. in this study, the amount of caffeine that a participant drinks is the

independent variable

answer; i believe its   (india); this is the correct answer; /// good luck

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 !