How likely are you to vote in the next presidential election? A random sample of 300 adults was taken, and 192 of them said that they always vote in presidential elections.

a. Construct a 95% confidence interval for the proportion of adult Americans who say they always vote in presidential elections.

b. An article in American Demographics reports this percentage of 67%. Based on the interval constructed in part a, would you disagree with their reported percentage? Explain.

c. Can we use the interval estimate from part a to estimate the actual proportion of adult Americans who vote in the 2008 presidential election? Why or why not?