D
DCJB
Guest
11.In the business of opinion polling, for example during the period leading up to an important election, it is common to select random samples of size around 1100 or 1200 to try to estimate the proportion of votes one of the candidates might expect in the election. On the other hand, polling done by the bureau of labor statistics to determine the current unemployment rate generally uses a sample of about 64,000. Explain why, in rather precise terms, the polling folks use such relatively small samples and the bureau such large ones.