In A Survey Of 1000 Voters 815 Were Able To Name Their 2 Us Senators A Create 95

In a survey of 1000 voters, 815 were able to name their 2 US senators.

a) create 95% confidence interval to estimate the proportion of voters who can name their senators.

b) using all available info, if we would like to determine the proportion of voters who cant name their senator to withing a margin of error of 0.03, how many voters should be the sampled based on the above data and a confidence level of 99%

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