Answer:
Flashing red and yellow lights control some intersections during times when there is low traffic flow.
Explanation:
Answer:
(3) pulse rate of each group
Explanation:
In any experiment if one wants to find the relation between two variables the effect of one variable on the other is studied.
If one variable changes irrespective of the other variable then it is called the independent variable.
The variable which changes when the independent variable changes is called the dependent variable.
Here, it is being determined whether the caffeine in the soda affects the pulse rate.
Hence, the dependent variable is pulse rate of each group and the independent variable is the type of soda given to each group.
