A program to help people stop smoking expects to obtain a 75% success rate. The observed number of definitive cessations in a group of 100 adults attending the program is 80. (a) What is the...

A program to help people stop smoking expects to obtain a 75% success rate.

The observed number of definitive cessations in a group of 100 adults attending the

program is 80.

(a) What is the probability that 80 or more people will stop smoking if the population

success rate is 75%?

(b) In your opinion, is 80 successes sufficient evidence to conclude that the success

rate has increased? Why or why not?