Before the Presidential Debates, It Was Expected That the Percentages $\alpha$

question 69

Essay

Before the presidential debates, it was expected that the percentages of registered voters in favor of various candidates would be as follows. 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 $\alpha$ = .05.
c.Using the critical value approach, test the hypotheses. Let $\alpha$ = .05.

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Definitions:

Felsic

A term used in geology to describe igneous rocks that are rich in light-colored minerals such as quartz, feldspar, and muscovite.

Pyroclastic Flows

High-density mixtures of hot volcanic ash, pumice, rock fragments, and volcanic gas that move away from the volcano at high speeds during an explosive eruption.

Mudflows

Rapid downhill movements of water-saturated earth material, primarily composed of mud and often triggered by heavy rainfall or volcanic activity.

Basaltic Lava

A type of molten rock that emerges from volcanoes or fissures on the Earth's surface, known for its low viscosity due to low silica content.