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A recent headline announced / impeachment causes a dip in a President’s Approval Rating. This conclusion was...

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Basic Math

A recent headline announced / impeachment causes a dip in aPresident’s Approval Rating.
This conclusion was based on a University poll of 100 adults. Inthe poll, 41.1% of respondents approved of the president’s jobperformance.


(a) Based on this poll, what is the probability that more than 50%of the population approve of the president’s job performance?
(b) Form a 90% confidence interval for this estimate.

(c) Assume we know without samplingerror the population support was 42% before the impeachment storybroke in September. Test whether the impeachment proceedings haveactually caused a dip in approval from the 42% baseline at the .05significance level.

Answer & Explanation Solved by verified expert
4.5 Ratings (860 Votes)
ap 0411 n 100 std error SE p1pn 00492 Z p p SE 05 0411 00492 1809 P p 05 PZ p p SE PZ 1809 00352 b Level of Significance 010    See Answer
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