A national polling organization wants to be 95% confident that its estimate of the percent of registered voters who say they plan to vote for a particular candidate will be within three percentage points (.03) of the true proportion that plan to vote for her. a) How large a sample do they need if the number of registered voters who plan to vote for her is in fact around 50%? b) How large a sample will they require for a margin of error of just one percentage point (.01)?
A national polling organization wants to be 95% confident that its estimate of the percent of
registered voters who say they plan to vote for a particular candidate will be within three
percentage points (.03) of the true proportion that plan to vote for her.
a) How large a sample do they need if the number of registered voters who plan to vote for her
is in fact around 50%?
b) How large a sample will they require for a margin of error of just one percentage point
(.01)?
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