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Carson wanted to find out if hand sanitizer works better than regular bar soap. He purchased 3 different kinds of hand sanitizer and 3 different kinds of bar soap. He then tested each by first rubbing his hands on three different bathroom door knobs, then touched a dish of agar in a figure 8 pattern. He waited 1 week for the bacteria to grow.

A) What is the independent variable?

B) what is the dependent variable?

C) what are two constants?

1 answer

A) The independent variable is the type of hand sanitizer or bar soap used. This includes the three different kinds of hand sanitizer and the three different kinds of bar soap.

B) The dependent variable is the amount of bacteria growth on the agar plate after one week, which indicates the effectiveness of the hand sanitizer or bar soap.

C) Two constants in the experiment could be:

  1. The method of applying the sanitizer or soap (rubbing hands on bathroom doorknobs and then touching the agar).
  2. The time allowed for bacteria to grow (one week).