Other core elements of hypothesis testing: sampling distributions, p-values, confidence intervals, type I and II errors. The first is the Central Limit Theorem, which plays an important role in studying large samples of data. Hypothesis testing is the backbone behind statistical inference and can be broken down into a couple of topics. For example, which distribution would flipping a coin be under? What about waiting for an event? It never hurts being able to do the derivations for expectation, variance, or other higher moments. Most of the time knowing the basics and their applications should suffice. The most common distributions discussed in interviews are the Uniform and Normal but there are plenty of other well-known distributions for particular use cases (Poisson, Binomial, Geometric). Understanding both discrete and continuous examples, combined with expectations and variances, is crucial. Probability Distributionsįor modeling random variables, knowing the basics of various probability distributions is essential. Knowing concepts related to expectation, variance, covariance, along with the basic probability distributions is crucial. The other core topic to study is random variables. One classic example here is the “stars and bars” counting method. Although it is not necessary to know all of the ins-and-outs of combinatorics, it is helpful to understand the basics for simplifying problems. The beginnings of probability start with thinking about sample spaces, basic counting and combinatorial principles. In case these statistical concepts sound alien to you, check out some of our favorite Statistics Books for Data Analysts to get a gentle refresher.
Probability & Statistics Concepts To Review Before Your Data Science Interviewīecause probability & statistics is foundational to the field of Data Science, before the interview you should review: links to more data science interview resources.solutions to 5 of the statistics questions.solutions to 5 of the probability questions.20 statistics questions asked by FANG & Hedge Funds.20 probability questions asked by top tech-companies & Wall Street.the probability & stat concepts to review before your DS interview.
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