The Quinnipiac University Poll conducts nationwide surveys as a public service and for research.
This problem is based on the results of one such poll conducted in May 2008. Independent simple random samples of registered Democrats, Republicans, and Independents were asked, "Do you think the United States economy is in a recession now?" Of the 628 Democrats sampled, 528 responded "yes," as did 231 of the 471 Republicans sampled and 472 of the 646 Independents sampled.
At the 1% significance level, do the data provide sufficient evidence to conclude that a difference exists in the percentages of registered Democrats, Republicans, and Independents who thought the U.S. economy was in a recession at the time?