Answer:
Observer Bias
Step-by-step explanation:
Observer Bias comes into play when an observer does not record all informations correctly or fully for a study. In this case the researcher may take abnormality from a group of subject for the study but fail to do same for all other groups.
In this question the bias comes into play because the same scenario played out between Lexi and Juan but Sabrina only recorded information for Lexi but left out Juan. She allowed her personal views to influence her data collection. This is what is meant by observer Bias.