Copy of Independent_Dependent_Control Variables

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Boston University *

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Mathematics

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Feb 20, 2024

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Name: ____________________________ For each item below, specify the independent and dependent variables, as well as constants. I - Independent D - Dependent C - Constant or Control 1. A study was done to find if different tire treads affect the braking distance of a car. I: Different tire treads D: braking distance C: the car 2. The time it takes to run a mile depends on the person’s running speed. I: running speed D: time it takes C: mile 3. The height of bean plants depends on the amount of water they receive. I: the amount of water D: the height of the plant C: the plant 4. The higher the temperature of the air in the oven, the faster a cake will bake. I: temp of the air D: how long will the baking take C: cake 5. Lemon trees receiving the most water produced the most lemons. I: receiving the most water D: produced the most lemons C: lemon trees 6. An investigation found that more bushels of potatoes were produced when the soil was fertilized more. I: the soil was fertilized D: more bushes of potatoes C: bushels of potatoes 7. Students measured the temperature of the water at different depths in Lake Skywalker and found that the temperature varied. I: depths of water D: temps C: depths 8. The amount of pollution produced by cars was measured for cars using gasoline containing different amounts of lead. I: amounts of lead D: population increases C: type of car 9. Four groups of rats are first massed and then fed identical diets except for the amount of vitamin A they receive. Each group gets a different amount. After 3 weeks on the diet, the rats’ masses are measured again to see if there has been a decrease. I: amount of Vitamin A D: mass C: diet Summary Independent Variable : What the experimenter changes during the experiment. Dependent Variable : What the experimenter measures. Constants : Things that are kept the same. Control : Thing to compare against to see if the Independent Variable has any effect.

Name: __________________________ Date: ____________Period: ________ For each experiment below, specify the independent variable, dependent variable, control group and any constants. 1. A student wanted to test how the mass of a paper airplane affected the distance it would fly. Paper clips were added before each test flight. As each paper clip was added, the plane was tested to determine how far it would fly. Independent variable: Mass of the paper Dependent variable:distance traveled Control: Plane without paper clips Constant: type of paper and how it as thrown 2. Two groups of students were tested to compare their speed working math problems. Each group was given the same problems. One group used calculators and the other group computed without calculators. Independent variable: Use of calculators Dependent variable is how fast students worked math problems Control group not using calculators Constant same math 3. Students of different ages were given the same puzzle to assemble. The puzzle assembly time was measured. Independent variable age of students Dependent variable how fast the puzzle is assembled Constant same puzzle There can be several controlled variables. If an experiment is to be useful, only one variable at a time can be manipulated intentionally. All other variables must be controlled throughout all parts of the experiment. If more than one variable is altered (changed), the results of an experiment cannot be interpreted with any validity. 4. An experiment was performed to determine how the amount of coffee grounds could affect the taste of coffee. The same kind of coffee, the same percolator, the same amount and type of water, the same perking time, and the same electrical sources were used. Independent variable amount of coffee used Dependent variable taste of coffee Constants (3) Type of coffee, type of water, time of percolation, amount of water, percolator used,

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