Interview Q&A / Data Science
Data Science interview questions
Statistics, pandas, cleaning data and exploratory analysis for analyst and data science roles.
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- Why is the range a weak measure of spread?
The range is maximum minus minimum, so it depends only on the two most extreme values. One outlier can change it enormously while the rest of the data is unchanged, which makes it unstable. IQR or standard deviation use more of the data.
BeginnerQuick answer1 min read - What is the coefficient of variation, and when is it useful?
The coefficient of variation is standard deviation divided by mean, often shown as a percentage. It measures relative spread, so you can compare variability between datasets with different units or very different averages.
IntermediateQuick answer1 min read