A data collection protocol calls for a questionnaire to be administered to patients having knee replacement surgery after the third physical therapy appointment. Errors can be introduced into the study by
a. giving the questionnaire to all participants.
b. reading the questionnaire to the participants with poor reading skills.
c. giving the questionnaire to all participants when they arrive for their appointment.
d. giving the questionnaire to the participants after the appointment to be completed while they have a snack.
ANS: C
A
Giving a questionnaire to all participants follows the timing of the protocol.
B
Reading the questionnaire to participants with poor reading skills follows the timing of the protocol.
C
Giving the questionnaire to all participants when they arrive for their appointment does not follow the protocol; the participant could fill out the questionnaire before experiencing the therapy session.
D
Giving the questionnaire to the participants after the appointment to be completed while they have a snack follows the timing of the protocol.
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