1. A(n) ________ study follows the same research subjects with repeat testing over a period of time that often lasts weeks to years.
a. cross-sectional study
b. longitudinal study
c. case-controlled study
d. observational study
That study is generally known as longitudinal studies
Option (b) is correct.
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1. A(n) ________ study follows the same research subjects with repeat testing over a period of...
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