Linkedin Statistics & Math Interview Questions
Practice the exact questions companies are asking right now.
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Sketch distributions and compare mean/median/mode
Distribution sketches and summary-stat comparisons Answer the following conceptual statistics questions. Assume you have a large random sample and you...
Derive mean and variance of x̄
Let \(X_1, X_2, \dots, X_n\) be random variables, and define the sample mean as \(\bar X = \frac{1}{n}\sum_{i=1}^n X_i\). 1. Assume the variables are ...
Choose better bank queue and describe distributions
You are interviewing for a data role and are asked several probability/distribution questions. 1) Bank queue choice (queueing intuition) A bank has 5 ...
Derive expectation for two consecutive heads
Waiting Time Until First HH (Two Consecutive Heads) Setup Let T be the number of coin flips required until the pattern HH (two consecutive heads) appe...
Measure Causal Impact of Self-Selected App Redesign
Measuring Causal Impact of an Opt-in Mobile App Redesign Context A mobile app ships a redesigned UI as a new version. Users can choose to upgrade (opt...
Compare queues and interpret distributions
You are asked several conceptual statistics questions: 1. Two banks each have 5 tellers. Bank A uses one common queue feeding all 5 tellers. Bank B us...
Compare queueing systems and common distributions
You are asked several statistics fundamentals questions in a data science interview: 1. A bank can be organized in one of two ways: - System A: 5 t...