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Identify the independent and dependent variables in the following experiment: A scientist grew bacteria on the gel in her lab. She wanted to find out if the bacteria would grow faster on gel A or gel B. She placed a few bacteria on gel A and a few on gel B. After 24 hours, she observed how many bacteria were present on each type of gel.

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lakeshore777

The dependent was before she started changing them and the independent variable is the process of them changing.

michell96

The independent variable is the type of gel, the dependent variable is the growth rate of the bacteria.

Dependent variables and independent variables are terms used in mathematics, statistics, and other experimental sciences. Each of them is characterized by:

  • Dependent variable: Its value is the result of a series of variable conditions that are modified on purpose.
  • Independent variable: These are variables that are modified on purpose to show a phenomenon and obtain a result in a dependent variable.

According to the above, in the situation presented, the independent variable is the type of gel because two types of gel are used, to obtain different results according to the characteristics of each gel.

Additionally, the dependent variable of this experiment is the growth rate of the bacteria under different conditions (gel A and gel B).

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