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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- What is a z-score, and how does it help compare values on different scales?
A z-score is (value - mean) / standard deviation, the number of standard deviations a value sits from the mean. Because it removes units and scale, you can compare a Maths mark with a Physics mark fairly.
BeginnerQuick answer1 min read