Question: what exactly is variance. For example, if you had two data sets with like units what would it mean if the first data set had

what exactly is variance. For example, if you had two data sets with like units what would it mean if the first data set had a much higher variance than the second data set?

if you were conducting some statistical analysis procedure ( AKA using a model to test some hypothesis ) what adverse effect could an extremely high amount of natural variability within the data cause?

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