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Unformatted text preview: ded.
95% con"dence interval for this ratio is 1.3 to 7.7.
What is our scope of inference? CASE STUDY 2: AGENT ORANGE
E#ects of agent orange on troops in Vietnam
646 Vietnam veterans and 97 other veterans
Neither sample was randomly selected
Similar shape and spread
Scope of inference? DIOXIN CONCENTRATIONS DATA ANALYSIS DROP VETERAN 646 ALSO DROP VETERAN 645 Robustness of the Two-Sample t
Meaning of Robustness:
A statistical tool is “robust” to departures from a
particular assumption if it is valid even when the
assumptions are not met Assumption True, but it’s Assumptions of the Two-Sample t
I. Normal distributi...
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- Winter '08