A poll of 1,000 randomly selected registered voters was taken and 584 responded that they favor candidate X for governor (p 1 = 0.5840). Just before the election, another poll of 950 registered voters was taken and 401 individuals responded that they favor candidate X (p 2 = 0.4221). A 95% two-proportion z confidence interval for the true difference between p 1 and p 2 was found to be (0.1181, 0.2057). What is the meaning of the interval in the context of the problem?