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  3. 3).a political poll estimates that 48% of democrat

3).A political poll estimates that 48% of Democrat voters will vote for Elizabeth Warren in the...

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Statistics

3).A political poll estimates that 48% of Democratvoters will vote for Elizabeth Warren in the presidentialprimaries. They provide a \"margin of error\" of 3 percentage points,which leads to a 95% confidence interval of 45% to51%.


a) Explain what \"95% confidence level\" means.
b) Why is a confidence interval needed here? What does it tell usthat the \"48%\" does not tell us?
c) Which of the following is the best interpretation of theconfidence interval?
i) 95% of the samples had between 45% and 51% of respondentssupporting Warren.
ii) There's a 95% chance that between 45% and 51% of those sampledsupport Warren.
iii) We are 95% confident that between 45% And 51% of all voterssupport Warren.
iv) We are 95% confident that between 45% and 51% of those sampledsupport Warren.

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