1) A student at a college administers a survey to estimate the average number of miles driven weekly among on-campus students at USF. The student sends a questionnaire to the 35th person in each sampling interval, from a complete list of on-campus students provided by the registrar. What type of sampling has occurred? Simple Random Systematic Stratified Cluster Convienence Q2) A student at a college administers a survey to estimate the average number of miles driven weekly among on-campus students at USF. The student randomly selects 4 of the 10 dorms on campus and then randomly selects students who live in those 4 dorms to take the survey. What type of sampling has occurred? Systematic Cluster Simple Random Convienence Stratified Q3) Select all the studies where the explanatory variable is measured at the same time as the outcome variable. Clinical Trial Cross-Sectional Case-Control Cohort