Aradio station wants to know if residents in their area are in favor of a proposed tax increase. they invite listeners to call in to respond to the poll. a total of 645 of the 800 who responded were against the tax. the station calculated a 95% confidence interval and declared, "between 77.9% and 83.4% of residents oppose the new tax."a. because of the way the poll was conducted, the results are invalid. b. this is a valid interval, so the station must be right. c. we can't say for certain that between 77.9% and 83.4% of residents oppose the new tax because it is a 95% confidence interval.