Here is an example of a scientific investigation design with appropriate constants and variables:
- Consider the title of the experiment to be, "The effect of smoking on the breathing capacity of adults".
- So, alternative hypothesis can be, "smoking reduces the breathing capacity of adults".
- And, the null hypothesis can be, "smoking does not reduce the breathing capacity of adults".
- So, the independent variable will be smoking and dependent variable will be breathing capacity.
- Hence, this helps us see the relationship between smoking and the breathing capacity and how the breathing capacity changes with an introduction or alteration of the independent variable which here is smoking.
- External confounding variables that might affect the dependent variable and hence the results could be environmental pollution such as smog, industrial area with harmful gases in the atmosphere etc.
Learn more about variables here:
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