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 peeking at an A/B test or running many tests a problem?
Each extra look or extra comparison gives another chance of a false positive. With alpha 0.05, 20 independent tests give about a 64% chance of at least one false hit. Fix sample size in advance and correct for multiple comparisons.
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