Consider the St. Norbert's College poll of Exercise 5.
a) Are the assumptions and conditions met?
b) How many people would need to be surveyed for a 90% confidence interval to ensure the margin of error would be less than 2%?
Exercise 5
St. Norbert's College in Green Bay, Wisconsin, and Wisconsin Public Radio conduct an annual poll of Wisconsinites about political opinions. The Fall 2011 survey asked a random sample of 402 adult Wisconsin residents whether they think things in the country are going in the right direction or in the wrong direction. 66% said that things were going in the wrong direction.