Answer :
If the scientist is investigating the results of varying temperature on the growth rate of a bacterial culture. in this experiment, temperature is the: independent variable.
What is the independent variable?
This is the name that is used to refer to the variable that is used to determine the variable of interest in a statistical study. This is the variable that is manipulated in order to get the existing changes in the dependent variable.
The dependent variable in this question is the growth rate of bacterial. The temperature of the area is the independent variable that would be used to offer the explanations that can tell us the reasons why there is a change in the growth rate based on what we are observing.
Hence we can say that If the scientist is investigating the results of varying temperature on the growth rate of a bacterial culture. in this experiment, temperature is the: independent variable.
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