Statistical Sciences 1024A/B Chapter Notes - Chapter 9: Jonas Salk, Statistical Unit, French Horn
25 Feb 2020
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Observational study: observes individuals and measures variables of interest but does not attempt to influence the responses: purpose: to describe some group or situation, example: Four french horn students in the faculty of music each played an open note (a g) for as long as they could. The time in seconds that they held the note was recorded, the process was repeated three times. Experiment: deliberately imposes some treatment on individuals in order to observe their responses: purpose: student whether the treatment causes a change in the response, example: 1% of people who contracted the polio virus suffered from the paralytic form of the disease. A vaccine was developed by jonas salk. Tested in 1954, in the test 440,000 children received the vaccine and 210,000 the placebo. Individuals studied in an experiment are often called subjects, particularly when they are people. The explanatory variable in an experiment are often called factors.
