Question 15 3 pts For their statistics class project, students conducted a study to see if the shoes a person wears will affect the time it takes for them to run 100 meters. Each subject in the study was asked to run 100 meters on two different days-once wearing athletic shoes and once wearing their street shoes. For each subject, the day that was assigned to each shoe type was randomized and the run times were recorded in seconds. What is the explanatory variable in this study and what type of variable is it? The type of shoes, which is categorical O The type of shoes, which is quantitative The time it takes to run 100 meters, which is categorical O The time it takes to run 100 meters, which is quantitative O A subject's natural running ability, which is categorical es A subject's natural running ability, which is quantitative