Participant Selection:
The process of selecting participants for research (also called sampling). The participants who are selected are used in the research are said to form the sample.
Participant Allocation:
After participants have been selected, they have to be allocated, or assigned to a group that may be used in the research study.
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An individual difference variable are variables that occur naturally and that a researcher cannot assign a participant to. These include gender, age, height, etc. A manipulated variable a researcher can assign a person to such as a placebo group vs the actual medicine.
The difference is in the delivery of the items being apportioned. When a portion is allocated to a recipient, it is virtually reserved for that recipient - but not necessarily delivered to them and may still be held by the allocator. If the portion is distributed, then the recipient has actually received the portion that was allocated to them. This is the difference as determined under U.S. federal tax laws, as I understand it. It should be remembered that an allocation or distribution can be in both directions, i.e. even as assets can be apportioned to recipients, so debts or liabilities can be apportioned to those deemed responsible for them.
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