Tiktok Statistics & Math Interview Questions
Master your tech interview with our curated database of real questions from top companies.
Test Billboard Campaign Conversion Rate Exceeds 60%
One-Proportion Test for a Conversion Rate Context You ran a billboard campaign and measured conversions on a sample of N = 100 users. The observed con...
Control confounding in observational ad lift
Estimating the ATE of Ad Exposure on Conversions (Observational Setup) You cannot randomize ad exposure. Users differ in age, education, income, and o...
Decide if subgroup increases imply overall increase
TikTok Time: Subgroup Increases vs Overall Average (Simpson's Paradox) You are analyzing average daily time spent on TikTok by gender (male, female) a...
Act when A/B result is not significant
A/B Test Planning and Decision-Making for a 60s Video Change Context: You are evaluating a product change with completion rate as the primary metric. ...
Interpret and validate regression with interactions
Modeling 7-day Retention with LPM and Logistic Regression Context You have user-level data with a binary outcome retained_7d (1 if the user is active ...
Differentiate LDA and QDA; compute boundary
Binary Gaussian Classification: LDA vs QDA You are modeling a 2D binary Gaussian classifier with features (x, y): - Class 0: mean μ0 = (0, 0), covaria...
Optimize threshold using confusion matrix and costs
Calibrated Classifier on an Imbalanced Dataset (1% positives) You have a perfectly calibrated binary classifier evaluated on 10,000 held-out examples....
Derive L1 vs L2 effects with correlation
Multicollinearity: Ridge vs LASSO vs Elastic Net Setup - Two standardized predictors x1 and x2 with corr(x1, x2) = 0.99. - X'X = [[100, 99], [99, 100]...
Use DiD for staggered treatment adoption
Staggered DiD for a Weekly RPU Rollout (50 Regions, 2025-06-01 to 2025-08-15) Context and assumptions: - You have panel data at the region-week level ...
Apply PSM rigorously for observational A/B analysis
Task: Estimate ATT on 7-Day Retention Using Propensity Score Matching (PSM) Context You are given observational, user-level product data where users s...
Calculate Expected Draws for X > 0.8 in Uniform(0,1)
Scenario Quick probability check during a first-round screen to gauge statistical intuition. Question Let X ~ Uniform(0, 1). You draw independent samp...