Before the presidential debates, it was expected that the percentages of registered voters in favor of various candidates would be as follows.
$\begin{array}{lc}&\text { Percentages }\
\text { Democrats } & 48 \% \
\text { Republicans } & 38 \% \
\text { Independent } & 4 \% \
\text { Underiderl } & 10 \%
\end{array}$ 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.

Question

Before the presidential debates, it was expected that the percentages of registered voters in favor of various candidates would be as follows.
 $\begin{array}{lc}&\text { Percentages }\
\text { Democrats } & 48 \% \
\text { Republicans } & 38 \% \
\text { Independent } & 4 \% \
\text { Underiderl } & 10 \%
\end{array}$ 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.

Quizplus · Accepted Answer

The Answer of Before the presidential debates, it was expected that the percentages of registered voters in favor of various candidates would be as follows.
 $\begin{array}{lc}&\text { Percentages }\
\text { Democrats } & 48 \% \
\text { Republicans } & 38 \% \
\text { Independent } & 4 \% \
\text { Underiderl } & 10 \%
\end{array}$ 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.

Before the Presidential Debates, It Was Expected That the Percentages