<span>Controls are needed in a case-controlled study because the outcome would be invalid if there were no base controls to start with. It would be like trying to determine which cancer is more aggressive but if you don't have a control in place or to go by, your research would not have any validity.</span>
Build up the military
just like how usa got out of the depression
When Mark does not think his manager will assign any more resources to the project, he's exhibiting the barrier of reluctance.
<h3>Who is a manager?</h3>
A manager simply means an individual who controls the team and ensures that the goals of the organization are achieved.
In this case, Mark does not think his manager will assign any more resources to the project, he's exhibiting the barrier of reluctance. This is a communication barrier.
Learn more about managers on:
brainly.com/question/24553900