Question

Lupe is conducting an experiment to find out what type of antibacterial soap kills the most bacteria. in her experiment, lupe grows

e. coli bacteria in ten different petri dishes. lupe then sprays 10 milliliters of an antibacterial soap on nine of the petri dishes. each of the nine petri dishes is sprayed with a different brand of soap. lupe doesn't spray any soap on the tenth petri dish. in lupe's experiment, what is the independent variable?
a. the brand of antibacterial soap
b. the type of bacteria grown
c. the tenth petri dish

Answer 1

The correct answer is "The brand of antibacterial soap "

Step-by-step explanation:

An independent variable in an experiment is the variable that is changed by the scientist. Independent variables are also known as manipulated variables.

In Lupe's experiment, the independent variable is the brand of soap.

In controlled scientific experiments, only one variable should be changed at a time (i.e., there should only be one independent variable per experiment). If only one variable is changed, then it is possible to clearly relate experimental results to a particular variable.

Answer 2

The independent variable in an experiment is where what you would change.
So since this experiment is to test for different brands of antibacterial soap, therefore lupe changes the type of soap in each petri dish.
So the independent variable is a, the brands of antibacterial soap.

However, the type of bacteria grows is constant, and it should be the controlled variable. And the tenth petri dish should be the control of the experiment.