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Over a long period of time, researchers may retest the same people at different points in time as they age. this best illustrates a(n):

User Ashfedy
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the answer to this question is Longitudinal Study
The main purpose of this type of study is to find out whether a certain variable will give different response if the time factor is change.
Examples of this time of study would be: a sudy to find out how long it need for a certain viruss to develop if it got injected since early age.
User Iiz
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