Final answer:
It's important to include completion criteria in a behavior definition to determine when the behavior has been performed, especially in psychology research. The operational definitions must be both valid and reliable, and confidence intervals help understand the significance of differences between groups. Criteria for evaluating data should be strict whether for expected or unexpected results.
Step-by-step explanation:
To ensure a behavior definition is complete, it is crucial to include completion criteria. These criteria provide a clear and specific end-point to determine when a behavior has occurred. For instance, in an experimental design, completion criteria will help in measuring the outcome accurately by indicating when the behavior being tested is achieved. This could be essential in determining the effectiveness of a treatment or intervention in psychology research.
The operational definition must be both valid and reliable to be deemed effective. For example, defining "good drivers" as those "who have never received a traffic violation" offers a specific and measurable behavior that researchers could uniformly test. When it comes to confidence intervals, they provide additional insights into the variability of an estimated parameter and help to understand the significance of a difference between experimental groups.
Regarding your question on criteria for expected versus unexpected results, the criteria should be equally strict regardless of the result being expected or unexpected to ensure the integrity of the data. However, unexpected results may undergo additional scrutiny or verification to confirm their validity because they may challenge established hypotheses or beliefs.