ࡱ> CEB `bjbj 24xx`[[[[[ooooTo."$$$$$$O$[$[[9 [[""G2oO0[$$$ !: Experimental Design worksheet IV, DV, controls, and control groups NAME: _____________________________________________ PD: _____ DATE: __________ DIRECTIONS: Use each description and/or data table to help you identify or describe: 1) any independent variable(s), 2) the best dependent variable, 3) at least 3 variables that should be controlled or held constant, and 4) any control group(s) in the experiment. Make sure your answers are specific. Keep in mind that not all experiments have a control group. FISH EGGS: A scientist knows that the percent of fish eggs that hatch is affected by the temperature of the water in an aquarium. She is attempting to identify which water temperature will cause the highest percentage of fish eggs to hatch. The scientist sets up 5 aquariums at the following temperatures: 10C, 20C, 30C, 40C, and 50C. She adds 50 fish eggs to each aquarium and records the number of eggs that hatch in each aquarium. independent variable(s): __________________________________________________________ dependent variable: ______________________________________________________________ list 3 variables that should be controlled (held constant): _________________________________ ______________________________________________________________________________ ______________________________________________________________________________ describe any control group(s) in the experiment (if one doesnt exist, leave this section blank): ______________________________________________________________________________ ______________________________________________________________________________ mouthwash usedtime mouthwash was in mouth# of bacteria in mouth (average)none135A60 sec.23B60 sec.170C60 sec.84D60 sec.39E60 sec.81 MOUTHWASH: The makers of brand A mouthwash want to prove that their mouthwash kills more bacteria than the other 4 leading brands of mouthwash. They organize 60 test subjects into 6 groups of 10 test subjects. The data for the experiment is shown to the right. independent variable(s): __________________________________________________________ dependent variable: ______________________________________________________________ list 3 variables that should be controlled (held constant): _________________________________ ______________________________________________________________________________ ______________________________________________________________________________ describe any control group(s) in the experiment (if one doesnt exist, leave this section blank): ______________________________________________________________________________ ______________________________________________________________________________ GAS MILEAGE: A car magazine is trying to write an article that rates the top 5 most fuel efficient SUVs (the SUVs that can drive the most miles for each gallon of gasoline). They make sure each model of SUV has exactly 10 gallons of gasoline in its fuel tank and reset the odometer (instrument that measures the distance a vehicle has traveled) to zero. The SUVs are then driven until they run out of gasoline. The distance on the odometer is recorded. independent variable(s): __________________________________________________________ dependent variable: ______________________________________________________________ list 3 variables that should be controlled (held constant): _________________________________ ______________________________________________________________________________ ______________________________________________________________________________ describe any control group(s) in the experiment (if one doesnt exist, leave this section blank): ______________________________________________________________________________ ______________________________________________________________________________ FIRE EXTINGUISHERS: A firefighter is trying to figure out which type of fire extinguisher (CO2, water, or dry chemical) will put out fires the fastest. Think about the issue being tested and imagine an appropriate experiment to determine which type of fire extinguisher can extinguish fires the fastest. 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