Snapchat Data Scientist Statistics & Math Interview Questions
Practice the exact questions companies are asking right now.
How to Update Bayesian Model for Concept Drift?
Beta–Binomial CTR Model: Prior, Likelihood, Posterior, Smoothing, Intervals, and Drift Context You are discussing statistical foundations for a Bayesi...
Calculate Posterior Probability Using Bayes' Theorem Example
Bayes' Theorem Toy Problem: Spam-Flag Example Context You are evaluating a simple classifier that flags messages as spam. Based on historical data, yo...
Compute posterior spam risk from flags
A binary classifier flags spammy requesters. Last week the base rate of spam among all requesters was 12%. The classifier has true positive rate (TPR)...
Derive logistic regression and thresholds
Logistic Regression Deep Dive (Binary Classification) Assume a binary classification setting with observations {(x_i, y_i)} for i=1..n, where x_i ∈ R^...
Compute expectations and test fairness for coin flips
You are analyzing repeated flips of a (possibly unfair) coin. Setup Let the probability of Heads be \(p\) (unknown in general). Assume flips are indep...