26. Green Behavior: Purchasing Habits A recent Harris Poll on green behavior showed that 25% of adults often purchase used items instead of new ones.

Consider a random sample of 75 adults. Let pˆ be the sample proportion of adults who often purchase used instead of new items.

(a) Is it appropriate to approximate the pˆ distribution with a normal distribution?

Explain.

(b) What are the values of mpˆ and spˆ?