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Before the presidential debates, it was expected that the percentages of registered voters in favor ...

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Before the presidential debates, it was expected that the percentages of registered voters in favor ...

Before the presidential debates, it was expected that the percentages of registered voters in favor of various candidates would be as follows.

	Percentages
Democrats	48%
Republicans	38%
Independent	4%
Undecided	10%

After the presidential debates, a random sample of 1200 voters showed that 540 favored the Democratic candidate; 480 were in favor of the Republican candidate; 40 were in favor of the Independent candidate, and 140 were undecided. We want to see if the proportion of voters has changed.

a.	Compute the test statistic.
b.	Use the p-value approach to test the hypotheses. Let α = .05.
c.	Using the critical value approach, test the hypotheses. Let α = .05.

Textbook

Essentials of Statistics for Business and Economics

Edition: 7^th

Authors: Anderson, Sweeney, Williams, Camm, Cochran

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Thanks for your help!!

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