A presidential candidate advertises on TV by comparing his positions on some important issues with those of his opponent. After a series of advertisements, a pollster wants to know whether people have changed their opinion about the candidate. The following are the data based on a survey of 950 randomly chosen people:
Before the Advertisement Was Shown

After the Advertisement Was Shown

Let pi, I = 1, 2, 3, 4, represent the respective true proportions.
Test
H0: p1 = 0:35; p2 = 0:20; p3 = 0:15; p4 = 0:3
Versus
Ha: At least one of the probabilities is different from the hypothesized value:
Test this hypothesis using α = 0.05.

Transcribed Image Text:

Support the Oppose the Need to Know More Candidate Candidate About the Candidate Undecided 20% 5% 35% Support the Oppose the Need to Know More Candidate Candidate About the Candidate Undecided 45% 25% 2% 28%