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Instruction 3-4
The ordered array below represents the number of cargo manifests approved by customs inspectors at the Port
of Brisbane in a sample of 35 days.
16, 17, 18, 18, 19, 20, 20, 21, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23, 24, 24, 24, 25, 25, 26, 26, 26, 27, 28, 28, 29, 29, 31, 31, 32, 32
Note: For this sample, the sum of the observations is 838, the sum of the squares of the observations is 20,684, and the sum of the squared differences between each observation and the mean is 619.89.
-Referring to Instruction 3-4,the interquartile range of the customs data is _____________ .
Double-blind Studies
Research studies where neither the participants nor the researchers conducting the study know which intervention or treatment participants are receiving to prevent bias.
Ethnographic Studies
Research methods that involve the immersive observation and detailed documentation of people and cultures in their natural environment.
Case Studies
Qualitative research methods involving in-depth analyses of individual cases, events, or organizations to explore complex phenomena.
Natural Observation
A study approach where participants are monitored in their own environment with no intervention by the observer.
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