Experimental Va EXERCISE 7: EXPERIMENTAL VARIABLES Determine the variables teste

Question

Experimental Va EXERCISE 7: EXPERIMENTAL VARIABLES Determine the variables tested in each of the following experiments. If applicable, de determine and identifly any positive or negatiw Different sized 1. A study is being done to test the effects of habitat space on the size of fish the fish are fed the same type and amount of food. The aquariums are six goldfish in each one. Ov maintained and cleaned throughout the experiment. The temperature of the water is kept constant. Al the end.ci the number of surviving fish are surveyed. er a period of six months, A Indapendent Variablepece in tank B. Dependent Variable: C. Controls: To determine if the type of agar affects bacterial growth, a scientist cultures E. coli on four different are set up to collect results types of agar. Fiv One with nutrient agar and E. col

Explanation / Answer

Independent Variables = This is a variable that is changed or manupulated or controlled in a scientific experiment to determine the value of dependent variable.

Dependent Variable = This variable depends upon the Independent Variable. This is the one which will be tested in a scientific experiment.

Controlled Variable = This is the variable which is kept unchanged or constant in a scientific experiment.

1. A. Independent Variables - Effects of Habitat space (Different sized aquariums)

B. Dependent Variables - Size of Fish Population.

C. Controls - same amount and type of food fed to fish, Temperature of water is kept Constant and Maintaining and cleaning of aquariums.

2. A. Independent Variables - Type of Agar

B. Dependent Variable - Bacterial Growth

C. Controls - E.coli in all petri dishes.

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