What is an estimator?

Slides for “What is an estimator?”

Control questions

1. What is an estimator?
2. What is an estimate?
3. What does it mean that an estimator is unbiased?
4. What about a consistent estimator?
5. Is the sample mean \(\bar{X}_n\) unbiased and/or consistent?
6. Is the sample variance \(S_n^2\) unbiased and/or consistent?