Jiung is conducting a study that involves observing a child's reaction when his/her mother plays with another sibling. He is conducting his study in a controlled laboratory setting and has trained all his research assistants for observation coding with a detailed manual that included a literature review on the topic and his hypotheses for the study. Should he have included information about hypotheses in his coding manual?

Group of answer choices

yes, this limits observer effects

it would not matter as long as the coders do not interact with the participants

yes, this limits observer bias

no, a masked design would be better