EScience Labs and identify any positive or negative controls Observations 1. A s
ID: 142403 • Letter: E
Question
EScience Labs and identify any positive or negative controls Observations 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 is surveyed. A. Independent Variable: B. Dependent Variable: C. Controlled Variables/Constants: D. Experimental Controls/Control Groups To determine if the type of agar affects bacterial growth, a scientist cultures E. coli on four different types of agar. Five petri dishes are set up to collect results: 2. One with nutrient agar and E. coli One with mannitol-salt agar and E. coli One with MacConkey agar and E.col One with LB agar and E. coli One with nutrient agar but NO E. coli eScience Labs, LLC 201Explanation / Answer
1. A. Independent variable - variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable. = Aquarium size
B. Dependent variable - A dependent variable is what you measure in the experiment = Fish
C. Control variable - Element that is not changed
throughout an experiment = Temperature
D. Experimental control - Type and amount of food
2. A. Independent variable - Different nutrient Agar
B. Dependent variable - Bacterial growth
C. Control variable - Temperature
D. Experimental control - One with nutrient agar but NO E.coli
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