Complete · 30 Days143 / 143
MediumStatistics
Variance of the Sample Mean
Two SigmaDE Shaw
You average 100 iid observations, each with variance 25. What is the variance of the sample mean?
Approach
Var of the mean is σ²/n.
Related problems
Correlation of X and X²MediumOLS SlopeEasyMLE of a CoinEasyVariance of Uniform(0,1)EasyVariance of a SumEasyCentral Limit TheoremEasy
More in Statistics.