GOV 350K Lecture Notes - Lecture 5: Simple Random Sample, Eleanor Roosevelt, Extrasensory Perception
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5 (due friday, april 10, at 12pm: one way of checking the effect of undercoverage, nonresponse, and other sources of error in a sample survey is to compare the sample with known facts about the population. In the 2000 presidential election, a total of 1,313,899 popular votes were cast in iowa for presidential candidates (including bush, gore and third-party candidates but excluding undervotes - i. e. , votes with no clear selection for president). [hint] since the margin of error (m) associated with (1- )x100% confidence level (or, significance level) is. 2 it can be derived that the sample size z. Use this formula to calculate the n corresponding to a hypothetical or estimated value of . For example, if you want to see if gore and bush were tied, you may assume =50%. (2) use the formula for n to calculate the sample size required for =10%, 20%, 30%,
