Using a mystery shopper to try the hospital's phone system would be an example of which data-collection method?

Using a mystery shopper to try the hospital's phone system would be an example of observational data-collection method.

Explanation:

As the name suggests, the observational method collects data by observing a certain phenomenon as and when it takes place. The observational method is classified as a participatory study, since the researcher needs to be immersed in the setting where the respondents are. Such observation can be active or passive. Using a mystery shopper to try the hospital's phone system is an example of observational method because the phenomenon of trying the hospital's phone system is going to be observed while is occurs for the data collection.

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