Joelle Was Conducting a Six-Month Experiment in Which She Was

Joelle was conducting a six-month experiment in which she was interviewing members of the community to determine if a new police-community outreach program increased positive perception of police officers amongst the community.Four months into the experiment,a scandal regarding police brutality hit the news in a neighboring city,which had an effect upon this community's perception of police.Which source of internal invalidity does this example reflect?

A) maturation.
B) instrumentation.
C) compensation.
D) selection biases.
E) history.

Correct Answer:

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