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The pilot of an aircraft flies due north relative to the ground in a wind blowing 40 km/h toward the east. If his speed relative to the ground is 80 km/h, what is the speed of his airplane relative to the air?
Participant Attrition
The loss of participants over the course of a study, which can affect the validity and reliability of the research findings.
Longitudinal
refers to research or observational studies that follow the same subjects over a period of time, noting changes and developments.
Sequential Designs
A research method in which participants are studied or tested over a period of time at different stages or points.
Beneficence
The ethical principle that emphasizes acting in ways that promote the well-being of others.
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