Question

A March 2015 Gallup poll reports that 37% of Americans now view the Republican Party favorably and 39% view the Democratic Party favorably. Results for this Gallup poll are based on telephone interviews conducted March 5-8, 2015, with a random sample of 1025 adults , aged 18 or older, living in all 50 U.S. states and the District of Columbia. Select either the Republican or Democratic Party then use the survey result to give a 90% , 95% and 99% confidence interval for the percent of Americans who view the party you selected favorably.

a) 90% confidence interval

Margin of error Interval

b) 95% confidence interval

Margin of error Interval

c) 99% confidence interval

Margin of error Interval

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1. Does the confidence interval become narrower or wider as the confidence level increases?

2. Does the margin of error become larger or smaller as the confidence level increases?

3. what would happen to the width of the confidence interval when n increased or decreased?

Please show 3 examples

Answer 1

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