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.

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.

~kinetic ~potential

explanation:

kinetic and potential energies would be types of mechanical energies.