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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- How does a two-sample t-test work? Walk through a small example.
It tests whether two group means differ by more than chance would explain. The t statistic is the difference in means divided by its standard error; a large |t| gives a small p-value and evidence against equal means.
IntermediateQuick answer1 min read - What does a 95% confidence interval actually mean?
It comes from a procedure that, if repeated on many samples, would capture the true parameter in about 95% of them. It does not mean there is a 95% probability that this one interval contains the truth.
IntermediateQuick answer1 min read