The survey of study habits and attitudes is a psychological test that measures the motivation, attitude towards school, and study habits of students. The mean score range for US College students is 110.
A teacher who suspects that older students have better attitudes toward school gives the test to 20 students who are at least 40 years of age. Their mean score is 140 with a standard deviation of 30. Is this a convincing evidence that older students have better attitudes toward school? State your 5-step hypothesis and the diagram.