GED Science Practice Test: Developing a Procedure
When writing a procedure, a scientist includes a set of logical steps that address each of the required parts mentioned in this lesson: at least three tests of the independent variable (validity), at least three trials of each test (reliability), at least three controlled variables (reliability and validity), an experimental control when appropriate, and specific directions for how and when to measure the dependent variable. Additionally, the writing should be clear and logical so that another scientist could conduct the same experiment.
The following is an example of a possible procedure for the radish experiment, with each of its important parts labeled:
Use the hypothesis and procedure below to answer questions 1 through 4:
Hypothesis: If the altitude increases, then the boiling point should increase, because there is less pressure on the water to boil.
- With the altimeter, measure the altitude of your current location.
- Put one liter of water into a large pot and bring to a boil on the campstove.
- When the water is at a full, rolling boil, insert the thermometer and allow the temperature to stabilize. Record the temperature.
- Empty the pot and allow it to cool.
- Repeat steps 2-5 two more times.
- Repeat steps 2-6 at two other altitudes, being sure to record the altitude at each location with the altimeter.
- Measure the boiling point of the one liter of water at an altitude of 0 ft. (sea level)
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What is the independent variable in this experiment?
What is the experimental control in this experiment?
What would be another appropriate controlled variable to add to this experiment?