Use the following information to answer questions 12-15: The Ice Chalet offers dozens of different beginning ice-skating classes. All of the class names are put into a bucket. The 5 P.M., Monday night, ages 8 to 12, beginning ice-skating class was picked. In that class were 64 girls and 16 boys. Suppose that we are interested in the true proportion of girls, ages 8 to 12, in all beginning ice-skating classes at the Ice Chalet. Assume that the children in the selected class are a random sample of the population.

12. What is being counted?

13. Calculate the following:

1. x =
2. n =
3. p' =

14. Construct a 99% confidence interval for the true proportion of girls in the ages 8-12 beginning ice-skating classes at the chalet.