Exhibit 12-6 The Following Shows the Number of Individuals in a Sample

Essay

Exhibit 12-6
The following shows the number of individuals in a sample of 300 who indicated they support the new tax proposal.
We are interested in determining whether or not the opinions of the individuals of the three groups are uniformly distributed.
-Before the presidential debates, it was expected that the percentages of registered voters in favor of various candidates to 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. At a 5% level of significance, test to see if the proportion of voters has changed.