40. Economy, part 2. The same Gallup Poll data from Exercise 39 also reported that 33% of those surveyed rated the economy as Poor. The same media outlet claimed the true proportion to be 30%. Does the Gallup Poll support this claim?

a) Test the appropriate hypothesis. Find a 95% confidence interval for the sample proportion of U.S. adults who rated the economy as Poor. Check conditions.

b) Does your confidence interval provide evidence to support the claim.

c) What is the significance level of the test in b? Explain.