Test the Hypothesis Presented in the Problem Below

Essay

Test the hypothesis presented in the problem below.
Each of the cards below has a number on one side and a letter on the other side. Two of the cards have their letter side showing and two have their number side showing. Here is a rule: "If a card has a vowel on one side, then it has an even number on the other side." In order to check whether the rule is true or false, which card or cards below would you turn over? Turn over only the card or cards that you need to check to be sure.
Explain how the answer to the problem relates to hypothesis testing, proof, and disproof.