Statistical Sciences 1024A/B Chapter Notes - Chapter 9: Frappuccino, The Sketches, Hypergeometric Distribution

• School: Western University
• Department: Statistical Sciences
• Course: Statistical Sciences 1024A/B
• Professor: Koval

Document Summary

9. 1: this is an observational study: no treatment was assigned to the subjects; we merely observed cell phone usage (and presence/absence of cancer). The explanatory variable is cell phone usage, and the response variable is whether or not a subject has brain cancer. 9. 2: this is an experiment: each subject is (presumably randomly) assigned to a group, each with its own treatment (arial or brush font). The explanatory variable is the font, and the response variables are then perceived effort (in minutes) and willingness to make the exercise part of their daily routine. 9. 3: this is an observational study, so it is not reasonable to conclude any cause-and-effect relationship. At best, we might advise smokers that they should be mindful of potential weight gain and its accompanying ailments. 9. 4: subjects: the healthy people aged 18 to 40. factor: the pill given to the subject. Response variable: the number (or fraction) of e"s identified by each subject.