Unformatted text preview: Student: Grady Simonton Course: Math119: Elementary Statistics - Spring 2.010 - CRN: 49239
Instructor: Shawn Parvini - 16 weeks Date: 2/18/10 Book: Triola: Elementary Statistics, 11e
Time: 10:54 ANI Determine whether the description corresponds to an observational study or an experiment. A study is conducted to determine if there is a relation between brain cancer and cell phone use. In an observational study, we observe and measure speciﬁc characteristics, but we don't attempt to modify the subjects
being studied. In an experiment, we apply some treatment and then proceed to observe its effects on the subjects. (Subjects in
experiments are called experimental units.) The description does not apply a treatment to subjects in order to observe its effects on the subjects. In fact, it would be
unethical to force subjects to use cell phones to determine if it increased the risk of brain cancer. Thus, the description is an observational study. Page 1 ...
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- Spring '10