Questions

1. Based on the data from last term's labs, which of the three methods (SRS, STRAT, and LD) seem to give unbiased estimates of the population proportion of Roosevelt votes? Which seem to give biased estimates? Justify your answers.
2. Based on the data from last term's labs, which of the three methods give the most precise estimates (i.e., answers that vary least). Which give the least precise estimates?
3. Explain the results you found in questions 1 and 2 in terms of what you know about the sampling and estimation methods used to obtain the estimates.