The investigators are examining differences on the following clinical interests and selecting the most appropriate statistical methods: Group of answer choices Whether younger children and older children show different level of anxiety (scores ranging from 0 to 10) during their CT scan. Whether there are differences in test scores among 3 groups of students in a Stats 1 class: International students, Female US students, and Male US students. Whether scores of depressive symptoms will be changed in a sample of psychiatric patients at hospital admission, discharge, and 1 month post-hospitalization. Whether satisfaction scores are different between OB patients in Cuyahoga County and OB patients at the national level (with norm score). Whether self-esteem scores between female and male siblings from the same family are different. Whether there are differences in happiness scores among 1st year, 2nd year, and 3rd year doctoral students, taking gender into account. Whether heart rates are faster before and after running a mile for 40 high school students with mental disorders