For this task, create another box model. Take 30 tickets (small pieces of paper), write one on 19 of them, and zero on the other 11. Fold these papers up and mix them up in a box or a bowl.

After that, draw 15 tickets from the box, replacing each one after you draw it. Keep track of the number of 1s you draw from your box.  

Using the procedure to calculate confidence intervals for percentages, which can be found in the textbook, calculate a 95% confidence interval for how many 1s there are in the box.

Repeat this procedure three times and record your results in this form. You should have three unique confidence interval estimates.