A student who claims that he can tell tap water from bottled water is blindly tested with 20 trials. At each trial, tap water or bottled water is randomly chosen and presented to the student who much correctly identify the type of water. The experiment is designed so that the student will have exactly 10 sips from each type of water. He gets 13 identifications right out of 20. Can the student tell tap water from bottled water at a 0.05 level of significance? Explain.