Na study of factors that might affect memory, research participants were assigned to drink either an alcoholic or a nonalcoholic beverage prior to completing a memory test. those who drank the alcoholic beverage were assigned to the group.

An experimental group

Explanation:

An experimental group is a group in which participants receive the variable that is being tested. They all receive one variable at a time. The result that are read from the participants in the experiment group are compared to a control group which doesn't receive any variable

Experimental group is the one which gives answers to a particular research.

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.