Snapchat Statistics & Math Interview Questions
Master your tech interview with our curated database of real questions from top companies.
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^...
Explain median vs mean for L1/L2
Median vs Mean Under L1 and L2, and the 2D Extension Task Explain, with intuition and a brief derivation, why: - In 1D, the median minimizes the sum o...