Question

battery life experiment

battery type	starting time	ending time	total time
b	1:00 p.m.	10:27 p.m.	9 h 27 min
c	1:00 p.m.	10:35 a.m.	21 h 35 min
d	1:00 p.m.	12:40 p.m.	23 h 40 min

destiny conducted an experiment to test which of four types of batteries lasts longest in a flashlight. she used four identical flashlights and placed a different type of new battery in each flashlight. she turned the flashlights on at the same time, and she recorded the time when each flashlight stopped giving off light. destinys data are shown. what is the independent variable in this experiment?

the starting time when each flashlight is turned on

the type of battery used

the total amount of time each battery lasts

the type of flashlight used

Explanation:

In an experiment, the independent variable is the factor that the experimenter changes or manipulates. Here, Destiny uses four different types of batteries in identical flashlights. She is testing how the type of battery affects battery - life. The starting time is the same for all, the type of flashlight is identical, and the total time each battery lasts is the dependent variable (the outcome that is measured). So, the factor she is changing is the type of battery.

Answer:

the type of battery used