0:00 Review of Last Class
3:16 Derivation of variance of post-stratification estimator of Mu
22:10 Example of post stratification to estimate the mean
29:30 Introduction to double sampling
30:21 Description of double sampling process
30:19 Double sampling declarations/nomenclature
31:30 Double sampling estimators
32:40 Illustrative example of how double sampling works
45:15 Introduction to lecture set 4 and ratio/regression estimation
47:32 Benefits of ratio estimation

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