A researcher records participants' weights every Friday for three weeks prior to administering a diet education program and for three weeks following the program.This study is an example of
A)a time-series design.
B)an interrupted time-series design.
C)a cross-sectional design
D)a longitudinal design.

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The Answer of A researcher records participants' weights every Friday for three weeks prior to administering a diet education program and for three weeks following the program.This study is an example of
A)a time-series design.
B)an interrupted time-series design.
C)a cross-sectional design
D)a longitudinal design.

A Researcher Records Participants' Weights Every Friday for Three Weeks