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Analyzing Variables in Scientific Experiments: A Guide

This guide explores independent, dependent, and controlled variables through four practical scenarios. The first scenario examines the effect of heat on water temperature using a Bunsen burner. The second compares cholesterol medications by measuring blood cholesterol levels after treatment. The third analyzes tire performance in auto racing, measuring lap times with different tires. Lastly, it investigates the cleaning effectiveness of store-brand versus name-brand laundry detergent. Understanding these variables is essential for designing and interpreting experiments effectively.

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Analyzing Variables in Scientific Experiments: A Guide

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  1. Variables Practice

  2. Directions • For each of the following situations, identify the independent variable, dependent variable, and constant(s)/controlled variables.

  3. #1 Heat is applied to water using a Bunsen burner. Over the time the water is heated, the temperature of the water is measured once per minute. The setting on the burner is not changed during the experiment. I: D: C/C:

  4. #2 A pharmaceutical company needs to compare the effectiveness of several cholesterol medicines. Groups of 100 people are given 400 milligrams of each medication over a period of one month. After one month, the level of cholesterol in their blood is tested. I: D: C/C:

  5. #3 An auto racing team wants to know which type of tire allows their car to go fastest around an oval-shaped track. They test 4 different tires for 25, 50, and 75 laps each and record the times it takes the driver to cover the laps. I: D: C/C:

  6. #4 A parent wants to know if the store-brand laundry detergent cleans their son’s football jersey as well as the name brand. One week they use one capful of store-brand detergent and check for stains. The next week, they use one capful of name-brand detergent. In both cases, the jersey is washed with three towels in a full tub of warm water. I: D: C/C:

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