A 2003 article in the Journal Nature explored the human tendency to turn their heads to the right when kissing a partner. A research team observed a random sample of couples (ages 13 - 70) in public places such as airports, train stations, beaches, and parks in the U.S., Germany, and Turkey. They observed 124 couples, of which, 80 leaned their heads to the right while kissing.

a) Determine and interpret a 95% confidence interval for the population proportion of all kissing couples who lean to the right to kiss.

b) Identify what "95% Confident" means in the context of this problem

c) Explain how your result from part a would change if the confidence level changed from 95% to 90% (with everything else remaining the same).