The Survey of Study habits and Attitudes (SSHA) is a psychological test that measures the motivation, attitude toward school, and study habits of students. Scores range from 0 to 200. The mean score for U.S. college students is about 115, and the standard deviation is about 30. A teacher who suspects that younger students have worse attitudes toward school gives the SSHA to 25 students who are less than 30 years of age. Their mean score is 113.2.
A. State the null and alternative hypotheses.
B. Compute the test statistic X§ .
C. Find the p-value.
D. Make a conclusion.