When comparing two population variances, we use the ratio 
rather than the difference 
.
Definitions:
Significance Tests
Statistical tests used to determine whether the observed data deviates significantly from the null hypothesis or not.
Significance Test
A statistical test used to determine if there is enough evidence in a sample of data to infer that a condition holds true for the entire population.
Random Sample
A sampling method in which each member of a population has an equal chance of being included, ensuring that the sample represents the entire population.
Significance Level
The probability of rejecting the null hypothesis in a statistical test when it is actually true; a measure of the risk of a Type I error.
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