Derive mean and variance of x̄

Quick Overview

This question evaluates understanding of expectation, variance, covariance structure, and how dependence between observations affects the precision of the sample mean.

Derive mean and variance of x̄

Company: LinkedIn

Role: Data Scientist

Category: Statistics & Math

Difficulty: medium

Interview Round: Technical Screen

Quick Answer: This question evaluates understanding of expectation, variance, covariance structure, and how dependence between observations affects the precision of the sample mean.

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Feb 19, 2026, 12:00 AM
mediumData ScientistTechnical ScreenStatistics & Math
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