Determine the variables tested in each of the following experiments. If applicable, determine and identify any positive or negative controls. Submit this exercise to your instructor upon completion. 1. A study is being done to test the effects of habitat space on the size of fish populations. Different sized aquariums are set up with six goldfish in each one. Over a period of six months, the fish are fed the same type and amount of food. The aquariums are equally maintained and cleaned throughout the experiment. The temperature of the water is kept constant. At the end of the experiment the number of surviving fish are surveyed. A. Independent Variable: Different sized aquariumsB. Dependent Variable: number of fish that survivedC. Controls: Negative controls are the food, maintenance, water temperature.

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Mathematics

Miracle Montoya

9 October, 21:38

Determine the variables tested in each of the following experiments. If applicable, determine and identify any positive or negative controls. Submit this exercise to your instructor upon completion. 1. A study is being done to test the effects of habitat space on the size of fish populations. Different sized aquariums are set up with six goldfish in each one. Over a period of six months, the fish are fed the same type and amount of food. The aquariums are equally maintained and cleaned throughout the experiment. The temperature of the water is kept constant. At the end of the experiment the number of surviving fish are surveyed. A. Independent Variable: Different sized aquariumsB. Dependent Variable: number of fish that survivedC. Controls: Negative controls are the food, maintenance, water temperature.

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Steven Kelley · Answer 1

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Hello!

Your experiment:

A study is being done to test the effects of habitat space on the size of fish populations. Different sized aquariums are set up with six goldfish in each one. Over six months, the fish are fed the same type and amount of food. The aquariums are equally maintained and cleaned throughout the experiment. The temperature of the water is kept constant. At the end of the experiment, the number of surviving fish are surveyed.

To determine the study variable (or dependent variable) in an experiment you have to identify what is being recorded. In this case, your record is the amount of fish that survived in an aquarium of a certain size after six months.

Where "The size of the aquarium" is the independent variable, in other words, the objective of the experiment is to test if the size of the aquarium affects the lifespan of the goldfish.

To be sure that the rate of survival of the fish is only affected by the size of the aquarium other variables need to be controlled.

>Temperature of the water.

>Duration of the experiment.

>Type and amount of food.

>Species of fish and amount of fish in each aquarium.

>Maintenance of the aquarium.

All these variables can affect the survival time, keeping them the same during the experiment minimizes or "cancels" their effect, leaving only the size of the tanks as the only one that can modify the survival of the fish.

Negative control: It's used to determine if the experiment is affected by external factors. If this experiment gives away a positive result, it means that not all confusing variables are being controlled. This type of control is no exposure to the actual experiment and also done in parallel to it. All the controlled variables above were determined using negative control.

Positive control: It's used to prove the validity of the test. This control is not exposed to the experiment and is carried out in parallel to it and is used to obtain the expected results. This positive result ensures the success of the test. There is no positive control listed in the experiment.

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