A student in each class volunteered to be the subject of the test. The students claimed that they can tell the difference between Coke and Pepsi. Similar to the "Tea" test, I brought 8 cups to the class and filled 4 with Coke and 4 with Pepsi. The null hypothesis H0 is that the student can't tell the difference, and that he/she is just guessing. (The students were Melissa, Sean and Bryan in EC01, C01 and C02, resp.)
If the subject is just guessing, there is a 1/70 chance (1.4% probability) that all 8 cups will be identified correctly. So, I would reject H0 if that happens. (This is the p-value.)
Melissa got all 8 correct in the second attempt, Sean got all 8 correct, and Bryan made 1 mistake. So, I rejected my H0 in Melissa's ands Sean's cases by stating that I believed they could tell the difference between Coke and Pepsi. But I couldn't reject H0 in the last case because there is a 16/70 probability (28%) that a person guessing will make 1 mistake. (These probabilities are the result of using hypergeometric distribution.)
Here are some still pictures of the experiment in Section C02 with Bryan doing the tasting:
