A teacher wrote a test consisting of five dichotomous items and wants to know if the items adequately cover the content domain being tested. He decides to use the KR 20 formula to determine the...

A teacher wrote a test consisting of five dichotomous items and wants to know if the items adequately cover the content domain being tested. He decides to use the KR 20 formula to determine the internal consistency of the test. Using the following information, calculate the internal consistency using the KR 20 formula. Are the test scores reliable in terms of internal consistency?