The Psychology student extended her study to determine whether there is a difference in stress levels among SUSS students, SIM students, NUS students, and NTU students. She utilised the same instrument to measure stress. The stress scores of samples of students from the four universities were in TOA Data File 'Question_3b' worksheet. Conduct an appropriate hypothesis test, at the 5% significant level. and interpret whether there is a difference in the mean stress scores among the four universities.