Final answer:
The advantage of the observational method over the communication method of gathering primary data is objectivity.
Step-by-step explanation:
The advantage of the observational method over the communication method of gathering primary data is objectivity. When using the observational method, researchers are able to observe and record behavior without relying on self-reported data, which can be subject to biases or inaccuracies. This helps ensure that the data collected is accurate and unbiased.
For example, in a study comparing the effectiveness of two teaching methods, researchers could directly observe and document the behavior of students in the classroom, such as their level of engagement and understanding. This observational data would provide objective information about the students' responses to each teaching method, without relying on their self-reported opinions.