Beryl Is Conducting an Observational Study and Has Trained Two

Multiple Choice

Beryl is conducting an observational study and has trained two raters to use the rating instrument.Both of the raters drop out just after the study has begun,so Beryl has to substitute in less well-trained raters.Beryl has increased the risk of ____.

A) low reliability of the measure
B) low strength of the intervention
C) poor reliability of treatment implementation
D) random irrelevancies in the setting