Douglas conducts a focus group to gather information about blood donations. A focus group is more effective if it is led by

trained moderator.

Explanation:

A focus group can be defined as an interview conducted of some 6-10 people regarding a product before it is launched in the market. This group collects the data related to feedback by these group of people. This group use market research method to collect this data.

The focus group is led by a trained moderator, who leads each group within a span of 30-90 minutes.

In the given scenario, Douglas should appoint a trained moderator to lead a focus group to collect the information about blood donations. It is because a trained moderator leads a focus group more effectively and within a span of time.

Therefore, the correct answer is a trained moderator.

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